I was up at Inslee's Fish Farm a few years ago and watched some feed-trained crappie go after pellets in a vat. I feel that the production of feed-trained crappie maybe more feasible than the production of triploids or hybrids.
Making the triploid would still not be 100%, and individual ploidy testing is not an option as it is in grass carp production.
Making the hybrid may not be predictable, specifically fry survival rates.
Feed-training crappie then stocking them out with other feed-trained predators such as HSB and BLGL seems a viable approach.