Got a link for the bits? I have access to a machine shop. Wonder what's different about those bits vs metal bit.Nope they are stupid expensive for what they are....
I put an 8mm steel rod in my drill press chuck with a hole through it to add an arrma wheel hex. Even the tire truing bits are something like 60-85.00
I have used in the past a sanding block with 80 or 120 grit paper and that works well.
An alternative is to gear a car for 50 mph (less load on the motor) and either use the sanding block or hold it and let it grind the tires down on the pavement.
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