Pre blended nitrogen/CO2,75/25 mixes are available at some gas supply houses(welding supply?),sometimes available in CO2 tanks. All you would need to do is get a new CO2 hook up for the nitro beer and use that gas. If it is only available in nitrogen tanks, there is an adaptor for the CO2 regulator to convert it to nitrogen,then undo it and put on your CO2 tank for a more carbonated beer.
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