In theory it should be simple enough. The only bit that you'll need to change with the conversion is the aircon compressor. So you'll need to adapt the 4AG one into the original setup. This might need custom hoses, depending on the location and fittings on each compressor.
The only other connection is the AC clutch which will be a single wire control on both units and work exactly the same.
Then of course you'll need to regas the system afterwards too.