Point her butt into the wind first
This is a tough problem and if someone has a really simple answer I would like to hear that too. Assuming that I understand the situation correctly, Robert's suggestion to try and use a mid-cleat springline makes good sense to me. However, rather than fighting the wind by trying to power your bow through (which will be difficult as long as the angle between the aft running spring line and the vessel centerline is only small) my inclination would be to let the wind turn the boat for you by letting the bow blow off a bit while sticking her butt into the wind (and the channel). To prepare for this, make sure that both the bow and the stern line are led back to the vessel through smooth eyes or rings on the respective pilings and that her stern line is tied off to your port stern cleat. Now move the tail of the bow line over to the starboard midcleat (i.e. the forward dockline now runs from her bow cleat through the piling eye back to the starboard midcleat). Her bow will blow off towards the shore a bit and her stern should start pointing more towards the channel. If she does not rotate far enough to clear the stern piling when powering in reverse, then also move the tail end of the stern line over to her port mid-cleat. This should rotate your vessel further and get her stern to point into the channel. Perhaps you may have to adjust the tension and length on both sides. However, there is no hurry; you are still securely tied up between the two pilings and have only been rotating your vessel while going with -- not against-- the force of the wind. Up to this point, one person can do the job.As soon as you like the way the stern points, call the crew and post them at the midcleats. Go into reverse with the rudder amidships (no need for any attempt to steer until you have developed sufficient speed) while letting the aft line slip through the stern piling eye as the vessel starts rotating counterclockwise around the bridled bowline. As soon as you have rotated her far enough into the channel you can let her bow line slip through as well while asking the crew to retrieve both dock lines before switching into forward gear.If your vessel does not develop sufficient power in reverse and/or steers poorly, perhaps you may have to consider a Maxprop or Autoprop.Success!Flying Dutchman"Rivendel II"