Great idea! If not a dedicated forum/thread, then why not just start posting in general forums with "LFG" as the topic prefix?
LFG Star Frontiers Alpha Dawn online
Game: Star Frontiers Alpha Dawn
About: I'm looking for players for an online Star Frontiers Alpha Dawn game, occasional 1- or 2-shot adventures. The idea is to have a blast playing this great game, and leave politics/activism/etc. out of it.
Time: Saturday or Sunday afternoons, Eastern time USA.
Platform: We use Foundry VTT (free for players) and Discord for audio.
Reply here if interested! We have room for more!