I'm thinking it might be possible to shorten an old style rear sight from a 27 and relocate the front screw hole, maybe. I'd have to rummage through the parts bins to be sure.

BTW, those old ProPoint reddots are usually decent, unlike the Accudots. The size may be off-putting, but for Steel Challenge or other speed games, it has it's uses. Try it on a .22 pistol or rifle for blasting steel targets. Just keep the dot in the upper 2/3's- 3/4 of the "window" to avoid parallax issues. I'd rather use one of those than the "cool" C-More sights. Height above bore line is about the same, and the Tasco has click adjustments.