I agree that the M26 offered a lot over the M4-series, but the darned thing came into use so late in the war that it's almost a historical sideshow. There were 20 delivered in the first test batch (2/45), then additional numbers came later, so there were 300 in-theater with 200 of them in the hands of the troops by VE day. Still not bad for a tank that only existed as initial drawings at the time of DDay!
It's not K&C, but Forces of Valor makes a decent M26 in 1/32nd scale. It could be used as a background model for a K&C scene, or as a "stand in" waiting for a K&C equivalent.
Gary