Is it something that you really cannot find already ripped elsewhere?

Use rutracker . org, they have a lot of flacs. If you can't find it there, I'm sure it's on Soulseek, use the Nitoutine Plus client: https://nicotine-plus.org/

Unless something has changed, Amazon Music only offers low quality mp3 downloads, and sometimes even includes audio watermarks.

I think what you want is https://doubledouble.top/

paste the link in Doubledouble dot top

This telegram bot would solve the problem: @GlomaticoBlueMusicBot

I dont know any for amazon music, but theres a few that use Tidal which will probably have what you need. Here's a list of them: https://github.com/eduardprigoana/hifi-instances/

Not sure about amazon but if you search for deezloader/deemix you’ll find ways to self-host services that download flacs from deezer. Also, there are services on most chat apps that will do it for you too if you search for the same terms.