I'm not sure mixing and matching a set of 2 summer and 2 all season tyres is a good idea. No problem for a FWD car having the new set on the rears, but the axle with the all season tyres will inevitably grip worse in the warmer conditions and better in colder conditions (especially snow and ice), which in particular could make handling in wintry contions rather tricky.
Don't forget that generally it is not recommended that you mix and match asymmetric tyres (Primacys) with directional ones (most all-seasons, including CrossClimates) because they work in different ways and can lead to handling problems in bad weather.
Admitedly it's far worse to do it on the same axle, but still - it's also why it's not allowed in motorsport.
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