Briley? Ain't dat dem folks dats makes doze new fangled screw in choke gizmos? Hell, just have dem run a pipe threader down the muzzle and fit a set of dem dere Thin Wall thingamabobs.

All kidding aside, why not have it modified to accept Briley Thin walls? If you are going to use it for a variety of shooting situations it would make sense, would it not? OR, is is heresy and sacrilige to even consider screw in chokes on a double? IMHO you already ruined originality by having the chokes opened anyway.