Very clever Bruce!
I did a valve job on a GM V6 only to have one of the center head bolts strip out in the block.
I found a longer head bolt that would reach into the block about 3/4", so I got the idea to find a nut and get it onto the bottom of the bolt.
Problem was obvious, but I found a way to get the nut down into the block.
I brazed a steel rod to the nut at just the right angle, and dropped it into the galley and BOOM! She grabbed, I torqued, and snipped off the steel rod.
Man was I glad to move that project down the road!