It sounds feasible, but my concern is being able to monitor how much food the babies are getting, and their nutrient needs associated with it. Typically breeders try to provide as much nutrition as possible, so they enrich the foods they feed the larvae. This is done by gut loading. For example, many breeders feed their larvae rotifers that are fed a high quality microalgae that's full of DHA, EPA, and ARA. These nutrients are carried on to the larvae when they eat the rotifers. You can do this with BBS as well, but since they don't eat until after their second molt, newly hatched BBS won't have much in terms of nutrition.
I just think it makes more sense to hatch your own BBS, enrich them, then target feed them to your baby bangaiis. This way, the babies don't have to use energy to search for food. And searching for food in an 80 gallon tank could be difficult. It will also make for a very dirty tank in no time since not all of the BBS will be eaten.