I did consider this route, print to clear,sticky side to glass, say 20 mm extra around the disc,which would actually stick to the glass as you say. BUT,when you attempt to remove, it will actually peel away and it is possible to stick it to another piece of glass, with the ‘ disc intact,which kinda’ defeats the object.
The local papers were giving them away as a promotion idea, and numerous police forces have used the same type of idea over the years, as you’ve no doubt noticed.
Why the disc’s aren’t supplied tamperproof by the DVLA is a mystery,they seem to have spent a tidy sum lately with the fancy versions they are now issuing( No wonder it’s bl**dy expensive)
darryl 😀