psyphd29 hi
I'm an Ikon Pass person too, avid skier and traveler. I've thought about the subject of skiing overseas a lot since I'll retire at the end of this academic year. Japan is the first stop new winter.
My opinion, and it's just my opinion, is if you are travelling halfway around the world to ski, don't necessarily be restricted by where your Ikon Pass pays for the lift ticket. Lift tickets in Europe, Japan, etc are relatively cheap, and you've come a long way and spent a lot of money. If the snow is a lot better elsewhere, or if there is a stop that is more desirable/easier on your itinerary, definitely skip the Ikon destination for the more optimal choice.
Regarding Japan, next winter's trip was originally pitched as a "go to Ikon" trip, but very quickly it changed into a go where you really want to go trip.
The good news in Europe though, as I'm sure you already know, is that Ikon somehow managed to wrangle deals with FANTASTIC places to ski in the Alps. I think you can be well satisfied if you stay on the Ikon trail. Chamonix is a Whistler-level pilgrimage (or maybe that's the other way around). I'd ski Zermatt on bullet-proof manmade snow for the views of the Matterhorn. Kitzbuhel is an absolute old-school classic. And Dolomiti Superski is massive, varied, and insanely scenic.
It sounds AMAZING having 7 days at each.
Regarding transportation, You really don't need a car. It would sit in a garage for nearly the entire week at each place. In fact, at most of the destinations you'll visit, the rail system integrates directly into the lift system. It's not always right there but usually a short walk. In some places you get off the train, walk across the platform directly into a gondola loading zone. It's great.
When you are at your destinations, the lift systems on which you'll have free use for the week also serve as public transit. You can often take a lift up, and then right back down to a different village. And then there are efficient systems of public busses, also often free if you have a ski pass.
I think you are smart to go late January until mid February - most likely time of year to encounter good snow. Snow's always a crap shoot, but I hope you get great conditions at every place you go! What a great trip ....