I think a coalition of organisations with a shared interest in reducing light pollution is an excellent idea. While the CfDS could campaign purely on astronomical grounds, this won’t be important to many people and politicians. Joining forces with others who see the problems of light pollution from other perspectives will strengthen the case for change.
There is no mention of involvement with ‘climate activist’ groups or anything that is likely to be picked up by media as activism. I think you would find the majority of wildlife campaign groups go about their activities in a law abiding way, trying to engage with people rather than causing confrontation. That is certainly how our local wildlife group goes about their work. In fact we had a talk on light pollution this week.
British Astronomical Association
Supporting amateur astronomers since 1890