I would also have a look at the XDA forum. A very large percentage of devices that are not officially supported have unofficial ports (Lineage and others) that run 99% as well as the official ones.
e.g. my old Galaxy S8 was not official supported but one of the staff members of XDA made a port that runs like an absolute dream.
Check the unofficial builds on XDA. My bet is that it exists. The unofficial builds are rock solid if you're wondering. I have a 10 year old smartphone that runs Lineage18 flawlessly on an unofficial ROM
Yep, I've had to tearfully look away from better (and cheaper) handsets than the one I'm holding for the same reason. If it can't be repurposed don't buy it