We have a small number of these, that count as multiple or different cards at times. I find it a little hard for something like these not to ever been considered before, but I did want to throw this idea I have. Some Heroes and other cards interact with Punch cards, (Specifically Power Girl feeling almost always as an Inferior Superman.)
Super Punch or Power Punch: SuperPower (And starter but this could be addressed by text below)
+2 Power This card always counts as as Punch also
Cost 4
VP 1
Rocket Punch or Piston Punch: Equipment (And starter but this could be addressed by text below)
+2 Power This card always counts as a Punch also
Cost 4
VP 1
SuperSonic Punch: SuperPower (And starter but this could be addressed by text below)
+1 Power This card always counts as a Punch also
Draw a card
Cost 4
VP 1
This is just rough idea obviously.
Limiting amount of them in the deck (being only 1-2 copies per card) would limit the abuse ability of them.
I wouldn't suggest even a mid number of these cards in a set but 1-5 could add some distinction and alternate combos with cards that work with punches.