I would assume the pump power comes from the house? Why not put the
pressure switch in the house next to the tank and break the power
there? go from the breaker panel to the pressure switch, to the pump
house. Put a disconnect switch in the pump house so you can service
the pump and wire from there to the pump. You can use the existing
wire from the house to the pump, so it should be easy to do. The
voltage drop in the existing wiring should not change, as the wire
length is no different than before. You have just changed the location
of the switch, so everything should work just fine.

Of corse if the power feeds the pump house from somewhere else, forget
I said anything.

BTW, Every shallow well and booster pump I have ever worked on or
installed, said set air precharge to 2 PSI below switch cut-in setting
in the instructions. It gives you the biggest draw down on the bladder
tank.

Stretch