It looks like it would work fine. just might be a little more physical effort then most technicians are willing to do. check to see if it can pump liquid, otherwise, if its only vapor then these singel valve recovery cylinders would be a bad idea as it would take you forever to move all of the refrigerant as vapor. again if it can only pump vapor you would need a dual valve recovery cylinder so as to use the "push pull method" for refridgerant recovery.

I think this is how its set up, i made this drawing (anybody, PLEASE correct me if im wrong!!!)
Liquid recovery method: