Slap my face and call me revisionist, but I make a dovetailed base and drill press a hole for an 8X32 thread. I put a slight countersink in the bottom and screw an 8X32 bolt in tight. Cut it flush on the bottom and solder the countersink. Then I cut the top down to about a quarter inch and mount it on the gun.
If that don't turn your stomach, then I take a hack saw blade to the notch on the rear sight. It'll position well when I put it atop the barrel and slide it back and forth when sighting. One mounted, the bolt will fill the notch completely.
I was thinking of a drone to designate targets, but lost my nerve because that idea wouldn't even stand up to the lowly..." If they'd had it, they'd used it"...diatribe
Can't find this type of stud anywhere but I can hit stuff on the trail.
One more time if you have not heard it from me...There's a reason riflemakers make rifles and shoemakers make shoes...
Don't shoot yore eye out, kid
Capgun. AKA The Still River Cordwainer