You can run Android apps on a Linux phone via Waydroid, but banking apps could be an issue if they force these Google intrgrity checks. Grindr probably does not?
Anyway, you should be able to fire up Waydroid on your Linux desktop and test this beforehand. I have never done this myself, so I might have misunderstood something.
You can export your data from Spotify, and use that as a basis for downloading songs via for example yt-dlp (this can be automated), or slowly build it up again over time in whatever system you set up by buying the albums/compilations containing the songs.