Removing chokes to cylinder bore is not such a problem for a shotgun, cylinder bore is recommended for slugs and with modern wads cylinder bores pattern shot well.

I have often used my skeet chokes in my Miroku O/U when shooting ducks at closer range but notice I also score well on ducks at longer range too with these open chokes.

Friend of mine once went out for a duck shoot walking drains and streams and had a great shoot scoring exceptionally well on mallards and then discovered when he got home that he had forgotten to put a choke back in his Winchester semi auto gun when he last cleaned it so he shot better than ever with an open bore gun. From then on he just used his cylinder choke for that style of shooting.

Many shooters are over choked and use too large a shot size too.