Sorry I have to agree. Putting winter tyres on one axle only is tantamount to disaster.
Watch this and you will see why.
https://youtu.be/A5aMnmekA38
If after seeing this you still keep to the one set then please post regularly so we know you're still alive.
Would you mix radials and crossplies. NO. What you've done is far more dangerous.
Insurance companies don't want to know when you fit winters, but when ...cos im sure you will...have an accident, if they look at your tyres they will pay out only for 3rd party liabilities.
But its a free world...so if you cant afford another set then fine....sad, but your call.