Tenuki, you said you almost got them. What did you go with instead?
I decided to spend a season racing and also do some singlehanded cruising and let necessity make the choice. So basically for now I'm planning on furling the headsail then tying off the genny sheets on some side cleats and using the same winches/cleats as I have for the genny for the spin. I have my spin blocks attaching to the toe rail with spectra webbing ( bluewater climbing runners ). The spin blocks have beckets and I've attached lightweight shock cord between the beckets and stanchion to hold them off the deck.
I cleat on the winch using the blue rubber winchers, I 'm actually thinking of removing my bridge deck cleats that I was using before as I never use them now.
btw I've sailed on boats that use clutches ahead of the winches for sheets, and I never really liked that, great for all the other control lines, but IMHO sheets need to be able to run totally free at a moments notice, clutches can and will jam, especially given how sheets move. Having the line captive, even in the clutch open position means that kinks/etc in the line can stop/jam it. I really like clutches for all the other control lines and have purchased 2 D1s (3 lines each) for my cabin top and all my other controls (2 halyards, vang, cunningham, and probably my spin pole topping lift and foreguy).
I'd like to be able to fly the sym spin competently single handed, but I'm not there yet, so don't yet have a clear idea what deck changes would make that easier. I'm pretty sure I want the topping lift and foreguy led back before I try it though so I have to finish the cabintop clutch project first.
So basically I've put off the decision until I can sail for a while knowing the options. Hopefully one of the options will 'pop out' after a bit of time.