I was going to build an A-Frame before haul out (this weekend ugh)... I still am, and I will report back. Everyone I have seen build an A-frame, secured it to the mast with a fixed length and used the mainsheet to pull the A-Frame up (or let it down in our case)..
I propose to do the opposite, fix the line to the forward cleats, and use my mainsheet to rotate the mast downward. I will have about 7 foot of height to the mast, and the 3to1 of the mainsheet should provide ample strength to slow the decent. My wife and I raised the mast together, so this will give her twice the strength to better help me. I'll be catching! hehehe. Oppurtunity for her to off me now!
Here is a drawing I obtained of a gin pole arrangement that was sent to me as an alternative (again hand built):