B-26B largely fills that role and multiposition bombers take a lot more work to do than fighters.
The only B-25 that we need is the B-25C for early war scenarios. That coupled with the G4M2 and Wellington would give us early war, but usable, bombers for both sides in all theaters. The B-25J just does not really bring anything to AH much like a Halifax wouldn't bring anything to AH. That makes them much lower prioity aircraft.