eebb's fertile (full of ..it) brain comes up with the solution.
It is an 'ak-mak' sized strong plastic box that has, on one or two of the four sides, slots in the tray and in the lid matching slots the size of insulated duplex.
Mast wires come up thru a common hole in the cabin top directly into the box where they will be spliced, clipped, connected to their upper half that are directed into the tray each thru a slot. All wires and cable are connected in the box tray.
A clear silicone like insulating substance is poured into the tray surrounding all the connections, completely filling the space around and over the wires, the lid is slipped on and pushed down clamping each wire in place. Some of the goop may squirt out small spaces here and there, and out the bottom. When the stuff is set the box can be trodden on. That's it.
The pudding goop is, maybe, a friable plastic like the dip that comes from the saw sharpeners used to protect saw teeth. It is easily broken away and doesn't stick. If anybody knows what the fruitgel membrillo is, that's it.
So, since the plastic doesn't stick per se but likes to get real close - you pry up the lid. breaking the suction, lift the connection brick out and break it apart. Then pull the joints apart, cleanly detatching your mast.
The stuff picks off pretty clean. Then, repeat to go again. Easy. huh?