I think I found what you're looking for... You just need a metal rod and some brackets to mount it from off of the UDS.
The rod gets brazed/welded onto the top of the ball valve at the bottom, then maybe a support bracket for the rod 1/2 way up the UDS, then another bracket at the top with the handle from the valve brazed/welded on top of the rod. You could probly use small corner brackets from a home improvement place as the rod holders too. Just put the rod through the holes, but you may need to drill 'em out a little depending on the size of rod used.
Essentially making one really long shaft to the valve.
Or did I misunderstand what you were asking?