I have seen some of the adjustable sights to fit in a Novak lomount dovetail, and to be honest, I wasn't impressed. There may be better options than the ones I saw, I went with a different sight cut so I didn't look any further.
The Novak adjustable, "Extreme Duty" I think, seems pretty solid. It only requires a small flat to be machined in front of the existing lomount dovetail. If you decide to go back to a fixed sight, Novak makes one to fit the modified dovetail, but as far as I know, they are the only one.