I can't recall the specifics, but I once talked with Kermit Hoke about adapting a Pedersoli adjustable eyepiece to one of Kermit's sights. I dimly recall that it was doable, with some modifications. I'm pretty sure Kermit uses a 12-40 or 7/32-40 stem thread. Merit may make a disk with the correct thread (metric?)
As I'm sure you know well, the much vaunted "Malcomb" eyepiece has shortcomings, and all makes are not equal. Ask anybody who has started missing during a match. Kermit, fine low key fellow that he is, gave me a very detailed and informative explanation of this, effectively talking me out of a Malcomb adaptation for his sight.
Paul
