I have been deliberately pupating Black Soldier Fly larvae (Reptiworms, Nutriworms, Calciworms, etc) and letting the adult flies loose in my big walk in cage. The flies do not have a mouth they live just a few days as an adult to breed and lay eggs. They can not bite, sting or regurgitate...
I would recommend very high temps, like 90 plus all the time. Sweep the floor with a paint brush over to one side but leave it for the nymphs to eat and burrow in between major cleanings. Learn to tell males from females and only use males for feeding out of your colony until they are producing...