I ordered a generic usb fingerprint reader from amazon (sorry). It arrived today, and is recognized as Chipsailing CS971Fingprint, product 0x0236, vendor 0x2541. After loading up a version of libfprint from the AUR, the device was recognized, I was able to enroll a fingerprint, and now I have biometrics working on the FW12. This makes me happier than seems reasonable…
Not biometrics related, but I was able to get waydroid going with gboard, so I also have handwriting to text working for note taking. Score another one for the 12". The 13" and 16" machines are looking at it sideways…