Bob,

I've mounted a pad just forward of the mast and installed a spring loaded stand-up block that has a cam cleat. This allows the mast / foredeck to control the downhaul. I also lead the line aft so it can be set the same way you do now. The connection to the spin pole bridle is made with a block on a shackle. Although the extra purchase isn't needed, it has the effect of keeping the block at the base of the mast held upright when you try and release the line from the cam cleat.

I have the setup stowed on the boat right now. Next time I'm at Rhapsody I'll take a picture so you can see.