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Go buy some short hex head sheet metal screws and get the cordless drill out with a socket. On true snow and ice the knobbies are useless without studs or screws.
Rimlocks are for low pressures, below 18 PSI. You won't need any. Keep pressures in the low 20s so the tire flexes, beware of this as speeds increase, avoid highways and over 40 MPH.
Adding screws adds weight so don't over do it, but the more you have the more traction you get. If you use them on bare pavement they will be a hinderance and you can slide out easily, they also wear quickly and pull out.
I race snow scrambles and have tried many combos of screws and studs. They all suck. You can get great traction but will have low life, longer life, low traction. Pick your poison. I'd guess a line of 3 screws across the tire every 6-8" will get you by.
A cheap DS bike would be a far better canidate for this unless your bike is fairly trashed already.
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