Good move 
Can’t help with the sensor but I seem to recall it worked on e-oreo, if a bit unreliable; had to keep resetting it. However that was back in July last year: version 0.9.
FYI:
I ran the pie testbuilds from July to the end of the year; very stable and fingerprint sensor good nearly all the way.
There should be an upgrade to Q for the XA2 early next month
Both would be best with a return to emma for 50.2.A firmware before installing.