First, forget about using steel belted tires. Just don’t try it. They are HARD to cut no matter how you do it and it is dangerous with tiny bits of steel flying around your face and eyes. Not to mention that eventually you will get a sliver of steel in your finger or foot. If you have ever gotten steel in your finger, you know how aggravating that is.
There are plenty of nylon belted tires you can use. The most common source is the little donut spare tires in newer cars. These are the ones marked ‘Temporary Use Only and Don’t drive over 45 miles per hour.’ The reason being, they are not steel belted. You can get these at the junkyard or just steal one out of your neighbor’s car when they are unloading groceries.
https://www.instructables.com/Tire-Sandals/