Check this out:
Mast Raising From The Bridge? | TownDock.net, Oriental NC
Not really recommending it, but looks like it worked for them.
I used to raise/lower the mast
on my Dana 24 using a whisker pole as a jib
pole. A bit of vector analysis needs to be done to figure exact forces involved, and then check all lines, fittings and rigging
to make sure can handle the loads. The loads will be much higher than you likely think. Also need to anticipate all possibilities. For example, if boat starts to heel to one side and mast allowed to swing to down side you will quickly increase heel much more than you ever thought possible. Load needs to be restrained from all directions, and all moving very slow and deliberate. Lot's of opportunity for major screw ups.