How much work to move an air conditioner 240D W123?

[herring]

Hi,
I've found another W123 240D I'm interested in, the only thing it seems to be missing is a/c which is important to me. My current car has perfectly-functioning air conditioning (converted to 134a). Is it realistic to consider removing the air from one car and putting it in the other? Any sense of how many hours of labor that would involve, assuming I can't do it myself?