My shotguns are all older models, so I can't help with interchangeable adjustable chokes. However I can vouch for the usefulness of adjustable chokes.
I have 2 old bolt action shotguns with factory adjustables. One is a Mossberg with a factory C-Lect choke. The other is a Kessler with a factory Komp-Choke ( compensater\choke combo). You can,with a simple twist, switch from tight patterns for turkey over to wide open for slugs or a round of skeet. I would start by checking your LGS or a gunsmith to see what they can recomend. They may have an older Poly-Choke that they can install for you, or a barel that has one on it that will fit your shotgun. Hope this helps.
If I have to explain why I ride, you wouldn't understand. Explaining sex to an alien would be easier than explaining the feeling, one that boils all that is going on in your life down to what really matters each time you are in The Wind. All I can say is, Life is not Life without it.