Rail now suspended btwn Rastatt and Baden-Baden til 7 Oct. I'm already ticketed - sugg?

If you're not in a hurry stick with your original itinerary and take the bus shuttle between Rastatt and Baden-Baden. If you're going to be carrying too much luggale or don't fancy the change into a bus and back onto the train take the rerouting via Stuttgart.

in the email they sent me they did not offer a bus reroute as you mentioned above. The option I listed was the only one they gave me. I would be interested in more info on that. or just renting a car. We will each be carrying a 22 inch rollar and a backpack so manageable without having to book normally.

It could very well be that your trip is too far in the future to inform you. Some two months ago I got an email alert from the Bahn about a rerouting just a few days before the departure date.
I'd follow the suggestion not to change anything. It'll take you longer, but it's a much surer and less complicated.
And all that as a result of a new tunnelling technique which got wrong and will block this major route for another month. Just today I read that the rail cargo companies are demanding an explanation and an intervention from the side of the European Union.

not only is their suggestion overly complicated but it takes 20 minutes too long!!

stick with your original plan. The 12:40 from Mainz will terminate at Karlsruhe at 13:47 (no space for it at Rastatt)
There you wait a short while for the 14:00 to Rastatt which only takes 12 minutes.
from there you get a special shuttle bus which is only for 20 minutes around the damage to BadenBaden, there is plenty of time allowed for loading and unloading the buses
Then there is a special fast train to Basel which arrives at 16:47
and then the 17:04 to Luzern arriving at 18:05

how are y'all finding out that info about the bus? I can't seem to find the specifics and it is wasn't in the email as an option for me. The only reason I was leaving Bacharach so late was bc i wanted to catch that faster train fm Mainz to Luzern. If I don't have to do that I would rather leave Bacharach earlier and get to Luzern earlier. I could also rent a car and drive to Baden Baden or Freiburg and catch the train there but it doesn't seem like it saves me much time.

Just go to the Deutsche Bahn website and put in Mainz to Luzern on Sept 16 leaving at noon. You will get the current schedule with the replacement bus. This just causes a 1 hour delay in your original schedule, and a couple of unforeseen transfers.

ok I see that when I add in Mainz at 12:40 but when you do Bacharach departing as I was originally schedule at 11:36 it shows the whole Frankfort Stuttgart thing and doesn't show the bus option.

Yes, but if you want to keep your original ticketing, there is no change in the Bacharach to Mainz portion. So you could just stick with the plan.
Edit- I assume you are not in Europe yet. When you get to Germany, you could see if DB will let you change to an earlier departure due to the unforeseen circumstances. There is a 9:13 departure, still going through Rastatt that would get you to Luzern by 15:30.

No I am not in Germany yet so that is a good idea! Do you know how I keep them from automatically converting to the longer, more changes route? I have emailed them. I did get a good rate bc I booked so early so I do want to pay a bunch more money

You would think when I signed into my train account it would say something but it just pulls up the original itinerary with no alert to the problem even when I click on that itinerary

You got a Sparpreis ticket that is only refundable with a 17.50 Euro fee then you have to pay the new ticket price, whatever that may be. There is an implied guarantee that DB will get you there on time without major delays. There is a bunch of forms to be filled out to receive compensation, but rather than go that route, you'd be better to walk into a Reisezentrum (ticket office in a major station) and explain that you wanted to be in Luzern earlier rater than later. I am thinking that they would change your ticket without any fee or added fare. But if they don't, so be it.

I've taken a replacement bus before on DB, and it was not that big a deal. The buses are lined up waiting for the train. You get off with your luggage and they put it in the bus hold and you get on the bus. Bus drives to the next point where the new train is waiting. You get off and pick up your luggage and get on the new train. When everyone is back on board the new train, you proceed to the destination. They've been doing this for several weeks now, so they should have it down like clockwork.

I see that there is an itinerary leaving at 7:37 and takes the Frankfurt Airport to Stuttgart to Zurich route and gets to Luzern at 14:25. Maybe you can see if they will give you that one.

Thanks. I'm going to try your suggestions. If worse comes to worse I will stick with what I have but I want to do the bus option and them not automatically switch me to the other longer deal which is what pulls up when I enter my itinerary from Bacharach. I guess I will see what they say when they reply to my email or wait until I get there. Thanks for your help

not automatically switch me to the other longer deal

Don't worry, you won't be "automatically switched". The route via Stuttgart is just a suggestion. You are free to choose your route (even if including a big detour), and DB has suspended saver fare bindings to specific trains for connections on the Rhine route.
At the DB web site just type in your desired arrival time at Lucern and deselect the preference for fast connections. You will see everything that's on offer, including connections using the replacement bus. Your trip will be exactly one hour longer.

E.g., there is a connection Bacharach dep. 9: 36 - Luzern arr. 16:05 and another one Bacharach dep. 11:36 - Luzern arr. 18:05. There are alternative connections via Stuttgart avoiding the replacement bus, which take 20 min. longer (arr. 16:25 and 18:25, resp.).