Dual-use aircraft would defeat a heavy-bomber ban

How would a 1932 ban on heavy bombers affect the Second World War and Cold War?

It would probably collapse or be bypassed because large civilian, transport, and maritime patrol aircraft could be converted into bombers at the start of war.

A state could comply in name by building long-range transports, airliners, or maritime patrol aircraft rather than declared bombers. The same large airframes could then be converted rapidly when war began. Such a ban would be performative arms control that rewarded whichever power mobilized its dual-use fleet first.