I'm sorry, but welcome to the painful life of Parts Pairing and Activation Lock. Unfortunately the Logic Board is the brains of a Mac. Without it, the Mac is a piece of metal. So, Apple has block logic boards from being replaceable. Now, I do know it is possible to remove Activation Lock. You have to remove the T2 Security Chip and then solder a new one. You then have to use DFU Mode to re-flash the firmware. But, this process is extremely complicated. As far as I know, if you replace the Touch ID, you will never be able to use it again, all thanks to Parts Pairing.