They wouldn't need to do a P-70 to get the Hispanos. One of the first batches of A-20Gs had 4 20mms in the nose. Most of these were given to the Soviets under lend lease. HTC could add it as a (perked?) armament option to the G.
Besides, the P-70 is less powerful than the G, lacks the turret, has a belly pack that would add drag and it couldn't carry bombs.