For dumb printers we use CUPS, even cheap printers (Oki B412dn here) just plug into the network and are found by most things (even Windows these days).
I also use CUPS on a Pi to put a dumb printer on the network, but I still routinely have issues with my devices not finding the printer or not scaling the page properly.
This is why I was thinking that a plain web app with a known good driver could solve these problems.
