A fellow member of the IAA drew my attention to this:
https://astronomersappeal.wordpress.com
I haven’t looked through all the sources and links mentioned yet though.
I also see that the IDA have an article published in December on the subject of mega constellations as well
https://www.darksky.org/why-do-mega-constellations-matter-to-the-dark-sky-community/
Although I am still attempting to stay neutral and open minded, I am gradually growing more concerned.