Initiating blacklist stops any ongoing crafting/combat macro, might want to give it a shot to see if it works okay for you guys. (No idea if blacklisting in dungeon works)
You can set it like /blist add "Cancel Mymacropls" or any other names that people won't use (To avoid blacklisting actual player).

I tested with both crafting and combat macros (15 heavy shots lol), subsequent actions won't run when the blacklist confirm window pops.