I had to have a HomeBridge server already and was running it from a Pi Zero W -- I just decided to bolt it onto the back of the printer and make it pull double-duty as the CUPS box.

A little party trick -- depending on the printer, you might be able to get an "in line" power tap/Y splitter for the power cord to run the Pi and the printer off the same outlet. (My printer takes a normal C14, so I just split and slapped a USB brick on the other end.)