I'm actually currently working on such a thing because I'm also fed up of the lack of promotion for small indie composers like myself. Aiming to do an announcement sometime in 2020 and our first event in April 2020...!
I'd love to talk to you about how you're going about doing it! Maybe we could combine our efforts. If you like, we can talk about it on Discord or email: adesyndicate#2010 / adesyndicate@gmail.com
Hey Alexander! I've added you on Discord. I'm currently on holiday in Singapore so I won't be online a lot but happy to connect when I'm not abroad :).