It should only take about 5 seconds to super saturate the same gas under pressure through a SodaStream machine.
I just got back from a run to my favorite welding shop 'Big Tex' and got the oxygen bottle, regulator and rigged fittings (some tapping still required) to tap into the SodaStream. Should have O2 water charging ability here in about an hour. The pressure chamber containing the ozone generator plate may take another week as the ozone generator I purchased Monday only shipped regular mail Friday, not your normal fast fulfillment we've all come to expect from web vendors. That is where I plan to harvest the components from.