The fronts are 9.5" rim width while the rears are 10.5" IIRC. A standard 255/45 tire can be recommended up to a 10" width. No 255 R19 tire size is going to be a recommendation from Nokian for 10" much less 10.5" tires :
https://login.schneidertire.com/uploads/styleDataSheets/sds2344.pdf
A safer bet, depending if you can clear the brake shield, may be the older 19x8 or 19x8.5 rims and go fully square. Not only would the tires be cheaper, but you'll have an easier choice of tires for a square setup.
So say $370 for the BLE sensors, $1000 for the older set of rims and another $1000 for some real winter tires.