How about the user gets the option to add NFC pairing so strengthen the security of the fingerprint. Once the user sets both up, then he won't be able to login

How about the user gets the option to add NFC pairing so strengthen the security of the fingerprint. Once the user sets both up, then he won't be able to login until both are recognized for authentication. It should be hassle free if that NFC pairing comes from a smartwatch or smart-band and he just picks up the phone with that hand. The NFC authentication should happen automatically without thinking about it. The NFC would essentially function as an OTP 2nd factor (or FIDO U2F if that's better) to the fingerprint being the "password".