I tried this just over a year ago, but it is quite flakey. IIRC because of how PAM works, you have to wait until this PAM module times out before you can switch

I tried this just over a year ago, but it is quite flakey. IIRC because of how PAM works, you have to wait until this PAM module times out before you can switch to another form of authentication. (E.g. because fingerprint authentication fails.)