Get my Music from different sources (most streaming services can be downloaded from) and then tag them with MusicBrainz Picard. Sorts them neatly, gives them mostly way more metadata than any other streaming service and sometimes I tag them by myself
Currently using Symphony on android because it supports user defined artist metadata seperators (really wish more music apps would have that feature)
On PC I'm using mpc and controll it mostly via cli
They already have a confirmation box when you try to change the extension
I think you overestimate the average users willingness to read anything. Only thing they know is how to bitch about things not working even when they were told exactly why it's not working/what they did (wrong)
You're probably out of luck. Only thing you can do is download the 4k version in any language, get the german audio from somewhore else and splice them togetherr
On android I'm pretty basic:
On PC I'm using some more:
and probably some others I forgot right now. I also try to not use to many addons