I shoved a disused Raspberry Pi running cups behind my Laserjet MFP connected over USB. Works great. As a plus, I could install SANE and get network scanning from it, including from the ADF. scanservjs is a nice frontend for that.
THANK YOU. I've been looking for something like scanservjs for ages as a web frontend to my network scanner to feed Paperless. For whatever reason I never could find something when I would search. That looks like exactly what I wanted, penciling it in for a weekend project.