Pasteurization of regional drink - Question

We have here regional drink called "podpiwek" its drink based on malt which generate a lot of CO2. Its highly carbonated drink. In every source i read its written - not pasteurized avaliable to drink for next week.

I want to do it once a month and keep in cold basement.

Will pasteurization stop yeast processes? and if its highly carbonated, will pasteurization make a little bomb from bottles due to expansion of gases caused by high temperature? How to bite it to make it work?

Mixture base on fermentation of malt grains by adding sugar and yeast

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Chris_Young_80640

Stored at 2 °C, and in combination with a relatively low pH, I would have no concerns about it being safe for at least one month. Pasteurizing with heat would certainly be tricky, you would need a pretty sturdy pressure vessel to contain the CO2 pressure at elevated temperature.

Przemyslaw_93807

What do you think about using Keg in fermentation & pasteurization. It should resist the pasteurisation CO2 pressure.

4 °C wouldnt be enough? was thinking about storing keg in well, around 10 meters deep in water where temperature is constant (i have one next to restaurant so why not).