I agree so much! I have suggested something similar some months ago, and Iβve been told it could be too busted.
I see why but I think that, as long as the passive only protects the monster who has it, which should have a mediocre moveset, and, like you said, it bypasses enemy Stun Counters/Converters/Absorbers, it should be fine.
Niiice! Love this! Also Iβm not surprised you were the one to suggest an idea for an Explosive Revenge