I would get a Pedersoli and be done with it.
I don't think there is a "kit", per se'.
Taylor had a "Lyman" Bess many years ago - a .75 cal (11bore)- maybe 1981?. He used 100 2F GOEX, a .715", 545gr. ball and a .022" patch. With that combination, which chrono'd just under 1,200fps, he shot a moose at a range of 100yards. Hit dead centre behind the leg & through both lungs, the moose walked about 20 yards then fell over before he was loaded again. The ball holed it side to side stopping under the offshide hide, almost as flat as a pancake, barely a rounded bump on the back - I have it in my 'stuff' still.
His plinking, non-serious load of 80gr. 2F GOEX produced 1,080fps.