Yes, I'm gonna use passkeys to help simplify nostr key management when accessing nostr apps. The nsecs will be importable/exportable. All the pieces are almost in place to put it online for everyone to test. I just need to go back to drinking coffee or someone to whip my back.

Passkeys have become better with time. We don't need Apple/Google/MS/some-linux-distro-support anymore. E.g. Bitwarden (can be self-hosted) has a browser extension and native apps, supports passkeys and syncs keys across devices no matter the OS.