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Question about Green vignette for cars (Umweltplakette)
(sh.itjust.works)
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It's perfectly legal.
There is just the risk of damaging the sticker. They are not made for peeling of and then sticking again.
But if you break the sticker, you can simply buy a new one. Your right to have the sticker is in the vehicle's documents.
As someone else said in this thread, it's not legal. And it's surprisingly expensive, fines for not having the sticker is roughly 100 Euros. I believe getting caught doing what OP has suggested will be fined just the same.