I'm not sure if these Jedenastki visting Sweden had the skis just in case. The visit was in the May. So it was quite warm rather. I would say that the snow there became warmer.
However the Romanian ones had them attached during a winter. And that's the reason the kit has them included.
Also why not. Taking the Polish political stance and the french conception of sending to Finland the GC 1/145 Varsovie ( initially the III Fighter Squadron "Dębliński" ) with the Polish pilots who knew the plane type, the idea sounds very possible .