Shooting from the hip here, but I'm thinking a solenoid operated vacuum switch similar to the distributor advance vacuum switch used on the 70 and up models.
Connect the switch to the parking / running lights. Pull switch to parking lights, solenoid energizes, allowing vacuum to the doors.
Don't know whether that particular switch will allow sufficient vacuum to the door actuators
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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