Grape success! Just thought I'd check in on here now that I've finally taken the time to do this, and I successfully got my emunand region changed from a 9.1.0-20J to 9.5.0-23U and everything thus far appears to be working (with the exception of eshop, since as I've mentioned previously, the eshop doesn't interest me, so I've not even tried it out) even the keyboard and amiibo settings (though I don't have any actual amiibo to try it with).
The success I had came with following
these steps all way through (though only sticking to initial removal of the 3 system apps mentioned in the early steps, and including updating to 9.4.0 with Xenoblade and then 9.5.0 using files from 3dnus), then using
these amended steps with the CSV for updatecdn found in
this post with a slight change in that I did the steps 1, 2, 4, then 3 and skipped doing the 9.5 update again (since I already have the relevant files) and formatted emunand to clean up, and bam, everything was working perfectly fine.
I did keep up with most of the thread, though I admit that I missed a few pages the past week or two due to life being a bit hectic, so I'm not sure if people have already figured out the success I've had or not, but if not, this is how I got through all the bugs reported up to where I was keeping up, and if so, then I add my testimony to the fact that it can all be made to work.