Would Golden Shiners or Fathead Minnows be the best choice for a smaller pond? Maybe just a few pounds of both, see who wins.
If you're going to draw the pond down and remove all fish before it gets cold anyway, adding some tilapia might be a good call. Reading indicates that without predation mixed-sex tilapia ponds just become a mess of 3"-5" fish, which is great if you're using them to feed LMB.
