Of course such a thing is possible, but with the Allison weighing 40% more than the Conqueror, I'm not sure a V-1710-powered PB-2 would be practical as a combat aircraft. Moreover, with only about 30 PB-2As available, the development and conversion work would probably not be worth the effort and delay. Still - would be cool-looking!
Another possibility would be a Twin Wasp version as proposed by Consolidated for the P-33.