I don't know if they still offer them, but the FN SLP (semi-auto) and their pump action both used to be available with AR-style sights that were quite high. You could get a co-witness with those and the right RDS. The pump action is basically an updated Win1300, so good gun. The SLP is an excellent gun as well.
With the right machinist/gunsmith/good with his hands fella, it wouldn't be too hard to do a similar setup on just about any scattergun. A Picatinny rail on the received for the RDS and BUIS from an AR, then a front sight soldered/clamped to the barrel.
I want to play with it, but the front sight on the 590 with ghost ring sights is pretty high. Probably wouldn't work with an eotech or aimpoint but something like a Burris fastfire or similar may sit low enough to at least see the top enough to "aim"