I've finally managed to use flic to fire the GO button on Qlab without a hub.

I've been searching for answers everywhere and got an overly complicated response from Flic customer services that was no help at all. So... I'll put it here in case it can help someone else. It's so simple.

Open the Flic app, and select OSC. Port is 53000. Message is /workspace/{name of your Qlab workspace}/go

Make sure your workspace in Qlab is set up to accept OSC messages. (file/workspace settings/control/OSC)

And that's it!!! Why could no one tell me that?!