Removing the evap requires dash removal.- Not worth it unless you are replacing it.
Replacing seals is time consuming but very straight forward.
I would try and unscrew the quick connect and revert to the original setup. Its one less conection ie. place to leak. Also, a mechanic will think the charge is r134

I chose 180psi because I believe that is a reasonable limit to the low side. Any and every leak will show up at 180 psi. There is no need to go higher.

If it hold dead-nuts 180psi for 2 days then it is good.

Replace receiver/drier, pump down. Fill with nitrogen, pump down. Repeat 3 times.

If I remember, 3 cans of r12 from ebay is the perfect amount. I believe they where 12 oz each. The w124 is 2 lbs I believe, but there is a bit of waste in the can and in the hoses etc.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2