I recently threw https://www.ipfire.org/ onto an old PC to cover router duties for a small biz that had it's current old consumer Netgear die. I was really impressed with Ipfire. Up and running in about 20 minutes.

I was so impressed with it I tried to rationalize just keeping Ipfire duties but transferring it to a much less power hungry device but couldn't find anything that was modern and wasn't a hobbyist kit (like the Apu2). Other than their own licensed devices that were out of their budget (smallest one is $390 and still needs a separate wifi AP).