I hadn't heard of the MP2 until this post. Looking into it, aside from the SD card, the MP2 looks to win in every other aspect for me. I'll be keeping an eye on it.
I'll be running my Pixel 9 with Graphene until I can't, which should be awhile but the MP2 looks like an interesting project. Swapping to a Google-free OS is make or break for me so this seems to tick all the boxes. I can see the physical switch being assignable as something I'd end up not being able to do without lol.
Gonna look into the Minimal OS some more and keep a close eye on this. Thanks for the detailed post.