I too am wanting to push for early queens as a way at trying to beat out the africanized genetics in my area. What I have done is to provide the girls with foundationless and or drone comb to them in the fall. Then I have been feeding them like mad. I am hopeful that since they are being fed and feeling pretty sure of themselves they will start to produce an abundance of drones "early." This would then allow me to graft queens and give me a better chance of them mating with genetics I prefer.
I am still pretty new and have alot to learn and foul up before I get it right, but I think we have the same goal.