I found a screw in aperture for a ghost ring sight that I should be able to screw in the rear of the solid rib. I was thinking of a fluorescent (Raybar Type) sight for the front. Michael Orlen in Massachusetts has installed several sets of screw in chokes for me before. His work is amazing. The only reason for adding screw in chokes is that if the gun doesnt work out for slugs, I can still hunt some birds with it. I never had a problem with his work.

https://www.newenglandcustomgun.com/proddetail.php?prod=7201