I refer readers to some comments I made here two or three years ago, that as it is a road race, road-legal tyres should be used, with changes only allowed in the event of a puncture.
This would not only solve these interminable wet-or-dry tyre worries, but lead to development of the ultimate grippy but long life tyres for raod bikes.
If it restricted the speeds and power of the bikes, then so much the better - but they may have to put some corners back in the course, and bump-up some of the billiard table bits!