I will take the opposite approach. HBG will do very well in a small pond, provided you're willing to restock as necessary and feed. You will not need to drain and kill off, provided you stock smaller LMB, and keep cover to a minimum. This combination will provide great fishing, without worry of BG stunting. Some of the LMB will likely take to pellets, and you might be surprised to learn how well they will grow.....especially since they will be preying on yoy BG AND LMB.

I might also add RES and a handful of HSB.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.