Will they add size on, sure they will. Will they reach their full potential? Nope... How little of their full potential they reach, well that depends on how stunted they are. If it was me, I'd drop the cash into buying quality fingerlings, they're not that expensive.

As far as the HBG, HSB, BCP combo, with a feeding program, keeping cover and vegetation to a minimum and the addition of GSH, it could produce a decent fishery. There will be some competition between the HBG and the BCP. Pellets will help keep it to a minimum.