Nokian here.
Don’t get them only for driving wheels. They are not to get you moving on a snowy hill, they are to give you good traction on muddy roads, cold tarmac, damp grimy frosty roads (like todays).
If you only have them on the front you may be able to get moving on snow covered roads, but if you have all four wheels you will be able to drive fairly normally in snow and, crucially, corner and stop.
Imagine having a mud tyre on the front of your bike and a slick on the back. Imagine what’d happen when you try and slow and corner!
Depending on what size you have, it may work out cheaper to get a more common size and some spare steel wheels to match, since some sizes are a lot cheaper than others.