I would still invest in and install some type of cement board. Cembrit windstopper 4.5mm is not too expensive and doesn't weigh much. But I would probably install a slightly thicker one on the bottom row. I think there might be unfavorable periods during certain parts of the year that could cause growth on wood-based boards.
To answer my own question, it became wall sheeting, there were already 50 square meters lying around intended for this. Had to buy 60 square meters more.
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