Year-round tyres, but only on the winter rims

I think it makes sense to switch between summer and winter bikes. But think about it right now, instead of real winter tires to raise Michelin Crossclimate 2 all-year tires. But keep changing with the 19 ́ summer bikes. Because here on the Rhine are snow and frost real rarity. But also want to be safe, I should still have to drive over land in winter. (According to the test, the Michelin Crossclimate 2 on snow should still be at the level of good winter tires and ha There are often days between October and Easter with 20 degrees to 30 degrees, then dry days around the zero point again. For this range neither winter nor summer tires are optimal. Drive at present around 12tkm a year, 60% expressway, each 20% highway and city traffic. What do you think about it?