You're making this out to be
WAY more difficult than it needs to be.
You've already stated this is a #4 AN. I can tell it's a female.... even from a side view. Pitot /Static test hoses usually are #6.
You need an adapter.
You need to go to the flight-line more. This is "so" easy. Practical working skills on the aircraft is a must.... even for engineers.
If the switch has no threads and a proper adapter from the maintenance manual has not been listed then you'll need to use a chamber.....