I don't think so. If you look at all the smaller engine cars in pre-66 sports racing (Lotus 23B, Elva Mk7 etc) less and less of them seem to be out and running these days. There used to be a lot in Masters Sports Racing Masters. HSCC Guards Trophy still get a few as well. But there don't seem to be as many racing now as there were a few years ago. And I've never seen anything exclusively for very small capacity cars. I doubt it would be viable.
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