You usecase is basically you want to keep Bitwarden unlocked all the time so you can autofill without unlocking, and to supply biometric to unlock your most important accounts, not using your complicated master password.
The fact is, Bitwarden doesn’t yet have this feature, but you can vote for the feature here:
For now, it may be just easier (and way faster) to change your habit of locking/unlocking Bitwarden/your computer. For your unimportant accounts, just don’t log out so you don’t have to use Bitwarden to log in, mostly. For your important accounts, log out, but unlock Bitwarden with biometrics (without the master password reprompt) and autofill the login.