Good idea, I recall having read recently about that on the Forum, but I don't know if my Good old Subie's A/C could bear with it; recently I removed the A/C compressor in order to change the main Bearing as it became noisy with age and usage, thus explains the gas lost; however, despite of living on the Caribbean area, I don't like too much Air Conditioners, in fact, the only good use from them on a car that I really miss, is to Defrost the Windshield, during our frequent Downpours.
Kind Regards.