I have inmast so I do not have a sail in the way. There are no spare sheaves to be had since the outhaul sheave is always in use, even when the sail is furled and there are no reefing sheaves, but I could put a (very) substantial block on the eye that is on the mast to lead the line to one of the winches on the mast. I imagine that I would not have a spinnaker up in those conditions so those winches are available.
Back in the water in Grenada - with new main and #2 and cockpit canvas (Santa came early). Will spend the winter and early spring in the Caribbean and then head to Bermuda and the northeast US. Still trying to decide if we will bring the boat to Canada, either in 2015 or 2016.