Interesting but as you pointed out Android uses it so you are already there, right? You could just delete the windows partition and give the space to Android. There seem to be a few threads on how to to do that.
I’ll probably look at at rooting if I can be confident that I can recover the tablet as stock.
Maybe if you can find a Cherry Trail unit of some kind you can try out whatever drivers you need to get it going. It’s not a project that interests me, but it would be nice to see you have some success with it, if you decide to spend the time on it.