The rules state that lipos must be maximum of 7.4v nominal and 4.2v per cell maximum when charged. So nothing to rule out using 1s I can see. You might be a bit under gunned tho using the same motors as someone using 2s.
Couldn't you politely steer your club officials towards the BRCA micro section construction rules? Is it non hard case lipos that are the problem? There are some suitable hard cases that fit in some of the micro buggies
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