never seen anyone do it that way Ross ..... might give it a try !
For me is lay the mast on the tramp with the mast base about a foot past the bridal mounting points.
Sling the bridal over the mast.
Attach side shrouds and trap wires.
Pick up mast at the rear beam and walk up the centre of the tramp pushing the mast as I go.
Once the mast reaches ~30degrees the base rises up and is held by the bridal.... as you continue to push forward the base comes back down as the mast heads upwards
step off the tramp and the base is on the ground and the mast is verticle.
lift the mast via the rotation arm and place it into the mast-step whilst 'pulling the mast fowards'
one hand on the mast to steady it and the other hand takes the front shroud forward .... release the mast and keeping a firm grip on the front shroud reach for the bridal and then tie it
reversal for dropping the mast

One Idea I saw many years ago.....
the owner had a 4" pipe that was about 8" long and had the bottom plated off. A solid gate hinge and 2 bent "hooks" made a simple method of attaching it to the front beam.
the mast base was simply poked into the pipe and the side shrouds were then hooked into place, he then walked up the tramp and pushed the mast up.
The pipe "bucket" for want of a better word allowed the mast to lean forward slightly but not that far where it would fall dangerously past the point of ugliness.
the forward shroud was then loosely tied and the mast was then lifted up into the step..... then back to adjust the front shroud to the desired tension.
always thought I should make something like that simple system..... one day maybe