I can do it, but im so terrible on frontend development xD. You can use NWF for frontend app, and a little server in javascript with some module for plex communications.
The Wii U got a lot of potential and im trying to exploit that with themes, I hope i can polish these more but here is a proof of concept that making animated themes on wii u is indeed possible
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi