Have you found the 500+ names? Ihaven’t found them.
This next link indicates that the full list of names will be revealed in Oslo on October 18.
https://clintel.nl/prominent-scientists-warn-un-secretary-general-guterres/
The European Climate Declaration sent as part of the letter to Guterres was drafted by climate ambassadors from 14 countries. The official presentation of the Declaration (including the release of the full list of signees) will be held in Oslo on October 18 during the Natural Variability and Tolerance conference. More press conferences will follow in Brussels and Rome.
Here's a few (PDF format)