the wheel clamp is easy to remove - just deflate the tire and work it out. it has been done a lot of times. The Karachi traffic police had these at one time and people just deflated the tire - worked it out, replaced tire with spare, put the clamp in the boot and go home with it - later the clamps were found as cut up pieces in scrap metal markets.
The older spider type ones are the easiest to remove.
You dont need to buy these from the USA, order them from aliexpress or get a local lohaar/welder to make them for you - the same guys who make radio towers can make these.