David, that is exactly what I did with my sheets. The wind came up heavy on me and I had a 150 headsail up. I was on a broad reach and it was difficult to handle the tiller and sheet the headsail. I took the jib sheet and gave it one turn on the leeward winch brought it across to the the windward winch and gave it two turns around it and fixed it in the jam cleat. When I needed to trim I would pull the sheet to me and take up the slack.
I think I wrote a wall of text to basically say I I did exactly what you described.