http://sportsfeed.gr/maxh-gia-th-1-olympiakh-thesi-sto-varese/
According to this article (in Greek), only countries with one or less quotas can gain quotas in Varese at the European qualifiers. This means that BLR, CRO, CZE, DEN, FRA, GER, GBR, ITA, IRL, LTU, NED, NOR, POL, ROU, ESP, and SUI all can't compete.
Can somebody confirm this information? I am not sure how accurate it is. I knew that countries could only gain one quota from Varese, but I didn't know that already qualified countries with two or more crews can't compete.