If anyone here does start using passkeys, just please please please make sure you have backups. And test that you can restore from those backups!
I've read horror stories about losing or breaking a phone and being locked out of everything because the standard phone backups don't save the passkeys private keys.
Personally I'm waiting until Bitwarden supports passkeys and I've made damn sure I can restore them from backup.
I use a git repo combined with the basic install utility. Clone the repo, run the app installer, then run the install script. For symlinks I just use a zsh script.
Have you read Project Hail Mary?