This does not need to be this complicated and painful. I use Sierra Giant Scale fill valves. They have a schrader fitting, never leak, and are bulletproof. I listened to the pros when i first started and got a battery compressor, BVM fittings, and all that crap, but i spent more time working around it, so I got rid of that. Now i just take a bike pump to the field and fill my tanks in three pumps. Easy and simple. I can repressurize brakes and wheels in 1/2 the time of the folks with the electric compressors.

For the small stuff (MAP etc.) I still use the Robarts hand pump and fittings.

Keep it simple. Less to forget, less to break, less leak potential, and cheaper. There is enough complexity on jets without adding it to areas where it need not exist.