

If you’re using a keepass database, Keepass2Android can natively sync with many cloud options including self hosted and generic ones, even without specific “companion” apps. That’s what I use. In my case, it’s backed by my NextCloud, but it used to be Google drive before.
Just also sync the file on your PC, merging changes from different clients is part of the keepass database format and “just works”.
Also VaultWarden works great if your can self host it, but I prefer keepass for a variety of features and integrations.

The arch package has to be built somehow. You could look at that packages source to figure out how to manually do it on your system, or wait/hope the deb is being maintained and gets fixed.
It’s likely mostly some plumbing, like a systemd service with it’s configuration, to get the audio routed properly.