There is small UART biometric module https://www.digikey.com/products/en?keywords=2304-100018754-ND https://www.digikey.com/products/en?keywords=2304-100018754-

There is small UART biometric module https://www.digikey.com/products/en?keywords=2304-100018754-ND https://www.digikey.com/products/en?keywords=2304-100018754-... The biggest downside - it's more that 3 times more expensive than the device I have now.