Ugh, I forgot about this. Aren’t you still going to be able to install apps from third-party marketplaces? I thought the plan was just that the phone was going to hassle you and require multiple hoops.

Syncthing is probably a simple fix.

Coincidentally, I moved to self-hosting Vaultwarden last night, which is open source but compatible with Bitwarden. If you want a simple transition and are capable of hosting it yourself, that would be my recommendation.