What do you think of 5 nights Wengen and 3 nights in Murren? or should
I split evenly?
I like this plan. For my trip next June, I have 3 nights in murren and 4 nights in wengen. It literally takes mere minutes to check in and out of a hotel. So, I don’t think it’s a big deal to change locations.
For me, I like the idea of waking up in both locations as they both have great options for my early morning walk. Also, staying in both locations will give you a chance to fully experience both.
You’ll be out and about doing things during the day so I don’t see the construction being a big issue.
I'm thinking an extra day in BO and an extra day in Lucerne as a good
compromise.
This sounds like a good plan. I was disappointed with Bern and would not want to spend a night there.
I would finalize your plans soon if you can and start booking your accommodations as the price tends to just increase with time. I have my hotels booked already for June.