This bracket looks outrageous fun, pretty sure I'm going to make one.
Not sure if this will be helpful for you at all if they've scaled down the rewards, I was a somewhat competitive neck level farmer at 111 for a few patches, the most repeatable sources of AP are flying round (being flown round in your case) tagging Mechagon or Uldum(8.3) rares. Do you have access to the mission table? That's my steady income of around 400 AP per day with followers equiptment optimised for bonus objective % rather than speed or the "extra AP reward" (worthless in my experience). Can also be micromanaged on the wow companion app if you're tryharding it
Also BFA dungeon bosses gave say 15 each and a bonus at the end of the run too.
All this to be taken with a pinch of salt as it's from memory...and also potentially out-dated memory haha.