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.
Is it better to do the right thing for the wrong reason, or to do the wrong thing for the right reason? If you do the wrong thing for the right reason, is it still the wrong thing?
Si vis pacem para bellum.
There are two ways of doing something. Right and again.
If you can't be good, be great at it.