I added winches on the cockpit coaming, but I did use the sail with the cabin top jib sheet winches a few times before I installed extra winches. I installed Lewmar 30's, same as on the cabin top, got them from Defender cheaper than anything I could find on ebay.
The sheets go to blocks on the loops on the stern pulpit, then thru the arch to the winches. I use a twing from the sheet to a small block tied to the middle stanchion block, then back to a clamcleat I installed on the deck edge outside the coaming.
I didn't think the 3 or 4 feet the bowsprit moved the spinnaker tack out would make much of a difference, but it really does.