Does anyone have an idea on how to change the id’s of a lot of elements in a copied scene, without changing them one by one?
simply don’t use id’s, when not necessary 
sounds silly and is not concrete the answer to your question, but may help in the future!
if you need to adress elements in more then one scene or layout it’s better to reference to them by class …
example:
https://www.w3schools.com/code/tryit.asp?filename=FVBLC90C0H4L
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(@h_classen offers the best advice.) The only automation for changing IDs is if you have multiple elements selected and type in an ID, it can sequentially number them.
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