If you would really like me to address the practice you are describing I think this would be a fair place to start.
Can you be 100% sure that nothing that comes in contact with these fish has been contaminated with parasites or bacteria? That would mean all clothing that you wear when feeding, sanitizing your hands before feeding, sanitized nets, buckets and food feed to the feeder fish? All lighting, tank decor etc should be 100% sanitized. It will also be essential to maintain the proper light and temp cycles to simulate what is happening in their naturally ocurring body of water, and also keeping the fish in a very large enclosure so that they actually have to chase and hunt food (not this panzy stuff our pet fish get - catching a few guppies in 20 gallon tank - that does not require and stamina on the predator's part or any planning). You will need larger feeders than mosquito fish as the bass get larger. Since you stated you will be feeding fish from the lake they were caught in, do you have the ability to catch enough of the appropriate size food items all year? These feeders should not really be feed flake or pellet food since you can't say for certain what ingredients are going into that food. Worms would make a good choice, but would have to be wild caught in close proximity to the lake avoiding all fertilizers and pesticides.
If you are certain all the above criteria are met, I would take a sample of the water and have it tested by a lab along with fecal matter from all fish involved and have it tested for parasites and possible bacterial infection (I am not certain how you would get a fecal sample, maybe a vet could help with that). If those are all negative I would then contact your local wildlife officer to check legality of the issue for a final answer on the subject.
In reality, I would recommend giving the fish to someone who can properly house (think display tank at LFS, bait shop, nature center or someone with an isolated garden pond).