Last summer when IndieHackers launched on HackerNews and Complice was one of the businesses featured there, I made a "Hacker Hall" room (https://complice.co/room/hackers) and posted it to Show HN. It had people in it for a few weeks but it never quite stabilized.
Based on the experience with the private rooms, I think it would only take a couple of champions--people spending most of their working hours there--for it to then be attractive to visitors. This thread probably has enough people to do it. I'd say just comment below if you're willing to hang out in the room consistently for the next few weeks, even if nobody else is there. And if a few people are up for it, then give it a shot. And let me know so I can support you in that!
I think the other thing that's needed is for at least a couple people to actually turn on their cameras, and to chat during the pomodoro breaks, so that people are actually connecting with each other.
People could check in with you every few hours and ask you about the progress on your TPS Reports.
All just for 5% of your startup.
A while back I was playing around on shodan looking for open webcams and found a few where you 'could log in and see people working'. Or, mostly, watch people who probably should be doing something productive not actually working.
My favorite was a town square in Bulgaria, wonder if that one's still open...