Given they aren't going to shock the lake or hire a professional , I would be inclined to go with the fish feeding program. If adding anything, maybe some feed trained LMB or Hybrid Striped Bass. Are they against Hybrid Striped Bass? Those can grow rapidly on a feed program and personally I think are more fun to catch than LMB. You would probably need to cage them (let them grow out ) somehow depending on their initial stock size but with the funds they are willing to spend on stocking ,it shouldn't be a problem.
If nothing else, get the fisherman to chart the fish they catch this year , and agree to address the following year or after a few months it might become obvious to address a slot with the lmb.
