My option keeps evolving. This time, I'm goin' for broke.
The system that's evolved so far is failing, it keeps working loose.
I gave my buddy a pair of very rugged high 30mm airgun rings, that mount directly to the barrel dovetail. He pinned the rings to the original sight pin holes. 50 rounds into the experiment, it's zeroed and holding zero.
My next iteration will involve a 2.75" long dovetail to Weaver mount adapter, and a pair of Burris Signature 40mm Zee rings. Not cheap (about $75), but this just may be the final answer.
Greg