RFID probably doesn't bring much, engraving is easier and is hard to remove without marks. About that, France has an official method of tagging bikes which has been mandatory on new bikes since jan 2021. See [0] for doc in English and [1] for a video.
[0]: https://www.bicycode.org/pages-1/Documents_PDF/plaquette__Bi...
[1]: https://www.bicycode.org/faire-marquer-son-velo.rub-2/le-mar...