Have you tried one of the generic PPDs that CUPS offers?
-
Canon MF236n - I see that it supports IPP so I would give the
everywhere
PPD a try. -
HP P1505 - This little guy came out in 2003 and IPP Everywhere wasn’t around until 2013, so I would give the legacy
HP LaserJet Series
PPD a try instead.
If it works (or you find another way to get the needed driver) please do share for others’ knowledge!