Alarmio VS VinylMusicPlayer

I am aware of it. On Google Play you may encounter money demand, but in F-Droid or GitHub releases you just simply cannot. Note that Alarmio is not still maintained but when I tested it I did not encounter any issues with it, so I acknowledged polished experience rule.

On Google Play it is not but on F-Droid and GitHub it is.

Then you don't have to lock your phone to disable it. The fact that it hasn't been updated does not bother me. It is just an alarm clock which functions properly at least in my phone. But I can understand if you don't want to use it. In such a case, you can try Alarmio, Clock+, or Simple Alarm Clock.

You should try Vinyl Music Player from GitHub. Works best for offline files.

try vinyl music player, way better https://github.com/VinylMusicPlayer/VinylMusicPlayer

Another is Vinyl, which doesn't support Material You, but have a decent support of .wav music. Some users have some troubles, but Vinyl works on my phone. But, again, it doesn't support Material You.

Vinyl: F-droid || GitHub

Tbh i just use vinly as alternative player, i think no.3 which you mentioned got fixed in 2021 release and new bugs also got fixed in this release, i would suggest you to try vinyl as it recently recieved update and currently active, you can always fall back to phonograph plus if you don't like it :) Here is release changelogs

Vinyl Music Player (version 1.4.0): Light and slick material design music player

Vinyl Music Player may be what you are looking for.