A lot of misinformation on here, Nothing illegal about shortening the barrels on a rifle or shotgun as long as it stays about 30 inches total length.
As for the problem of chokes, if they are fixed you will end up with an open choked gun at worst, which is fine over pointing dogs as you are usually shooting a bird up the clacker at less than 20 metres anyway. If the gun is of thicker barrel wall construction, you could have it threaded for briley style multi-chokes.
My go-to gun is a Miroku that started life as a 28 inch gun fixed choke half and full. After an accident it was shortened 2 inches, now it is choked just under half and quarter - more applicable for my type of shooting and it patterned better to boot.
You will find a lot of guys going back to 30+ inch barrel on double guns as they swing better. I have a 30 inch barreled Gorosabel here which is nice but choked a bit too much for my liking. Wasn't going to get it chopped as it feels nice as is, was thinking to get the chokes bored out. Nothing wrong with long barrels on a double barrel
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