Mark

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.....