..... why can't you use the Windward piling(s) as a pivot point and stop point. I know from your great sketch you have an aft cockpit, but you still should be able to have a line on the piling. I also assume you have a CW rotating wheel(prop) which gives you port prop walk in reverse, making your bow move to SB or away from your neighbor and the finger pier, therefore hard reverse should keep you off the finger pier.
Getting a line on the piling is the tricky part. This technique would allow a bit more time to get a line on the piling, however. Being tied to the windward piling is far better than the leeward piling. But it still has to be done rather quickly since there is a component of wind trying to blow the boat away from the piling and slip. I need to study drift rate to see if I have time to leave cockpit, put the line over, and get back to cockpit (and maybe practice it with someone timing me, on a day when it's not too windy).