I'll get my hands on some WatchGuard AP120 Access points this weekend https://wikidevi.wi-cat.ru/WatchGuard_AP120 - which I can see are based on ath79. Working on those APs will not be a priority for me - and I have not ported openwrt to any device so far - but it will likely eventually happen.
However, if somebody is motivated to add support for them I will happily send one in a package to you if you can pay the postage. If you're broke I can pay for the delivery or we can split it :>
Anyway, I just wanted to make a stub for this. Will report more once I have them on my desk.