I know this thread is ancient, but it can be done. Did it for a shop over 5 years ago. After lots of studying of the securus system, don't mess with that side. Go to where the main control board for the compressor is at. Now if I saw this 5 years ago I could probably remember exactly which wire it was, but I don't. I do remember moving one wire so the securus system was still powered, but the switched wire coming off of the system did nothing. And the wire that was receiving the signal was moved to a different location.
The securus system is an add on, like adding a car alarm to your car. Think as if you were trying to put an interrupt into the system, then work from that logic backwards of where the securus has been inserted into the control board.
Trying to bypass it internally to the securus doesn't work. If the aftermarket add on car alarm has issues, you don't open the board and try to trick it, you just bypass it. It is not part of the original design, it is added off to the side. Un-add it.