David --
I had the same thing done for our old C&C 26 , by our Doyle loft in Cleveland. I just used the spin pole downhaul as a downhaul (it was a dip-jibe setup). I only used the sail twice, but the first time was critical, as it got us home when the engine failed and there was only a whisper of wind midway to the Lake Erie Islands. Since I'm also adding roller furling, I think I'll follow Thor's suggestion and get an ATN tacker and run a penant up from a block attached at the stem. I'm planning to try a regular chute before having one re-cut, just to see how it works.
Thanks.
Peter