Fan/ On off switch Idea

I dont know if this would work or not


But my LRP sphere TC esc has a place where you solder the fan wires too, and its becomes apart of the on/off switch circuit (not literally with to where the switch is) But when you flip the switch, it turns on

I took the fan off and ran it, but the speed went from never getting over 80 deg (has a internal temp feature) to running at 160, so I soldered the fan on the pos/neg wire right on the speedo

Problem is, is that I hard wire my batts, so I have to wait right up till im ready to race, and then solder on to have max power


Can I just solder my fan wires to the on off switch no issues? Or no?