That would explain it! 
If you’re adding extra components, maybe only have a single card with parry/no parry on it and you point the option you’re using toward the opponent like a normal card? Or maybe have them be like the Challenge/No Challenge mini cards in Pandante, where they’re small enough to easily hide in your hand until a simultaneous reveal.
Yeah, it seems like a fun variant, but I don’t think I’d want it as a part of the base game. Maybe it could be used for an arena card? 