I also cannot fit a Wayfarer mast in my garage, but I store the mast outside, upright against a drain pipe running down the side of the house. I’ve got a system with a block and line with a bracket to secure it at the highest point (I could describe further if you wanted).
There are 3 disadvantages to this system:
– it is subject to the elements all the time
– it has to be loaded onto the trailer whenever I use the boat (and off again before putting boat in garage)