Or just leave the boat pointed downhill on the ramp.... then turn it around with the mast up and secured...
What I did last summer when stepping my H14 mast (about 2-3 times a week) was to use the Main halyard hooked to a boat winch on the trailer... I had basically what amounted to two mast stands... The one closest to the boat had a simple hand winch mounted and I just had a place on the front stand in which to run the cable through.....Being who I am I would just step the mast the old fashioned way (without the aid of a hinge
) And then once the mast was up I would use the winch attached to the halyard to hold tension on the mast until I could hook up the fore stay.. It worked great.. If you look in the hobie catalog they have a couple different "easy step" systems shown. I have never looked at the mast base of a bravo, but I can't imagine it would be hard to make something similar to assist you with raising the mast..
If you have a sound way to hinge the mast near or at where it needs to go... and a SECURE mast stand in which to mount a simple boat winch.. The job should be easy breezy with two sets of hands... One to work the winch and the other to simply stabilize the mast as it goes up...