Not easy to find, but you might look for a Macnab Woodcock by Ugartechea. Mine is a 20ga, 30", F&F, straight grip, splinter, DT, 15"+ LOP, checkered butt, sidelock. I found mine at Cabela's, and Mid-South had one at one time. Paul Crosnoe had at least one, and Cape Outfitters had a couple so worth a call to Jeff's Outfitters. Uggie may have made this configuration for others, including Lion County. LOP on this one is too long for me, but it's so nice that I can't bear to cut it.https://www.shootinguk.co.uk/reviews/shotgun/john-macnab-woodcock-shotgun-review-2
Cabela's (a few years ago) had a large run of AyA boxlock 20s with 29" barrels, IC&M, might still be some around the system.