tried it on h5.9 using climbing rope with same reasoning , didn't work for me , problem was pulling sail in when trapezing by shroud , it took more than a good armfull to pull out the stretch before sail would move , reckon prob 10 foot of rope from block to hand in this scenario may be better on boats with no trap and helm sitting near blocks ,

but

square head sail is far better <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" /> if you have choice