I get your idea Jan, I could calculate the minimum pressure required to compress the springs and then install and adjust a pressure switch to that pressure. The pressure switch will keep the solenoid valve on when pressure falls to the minimum value so the flipper remains closed even if I try to fire it.
Will need an override then to dump residual pressure from the rams in order to disarm it safely.
If any of the event organizers or tech checkers read through this build I would need some help from their side to make sure I'm within the rules.