I’ve managed to knock up a standalone Syrinscape 3rd Party Integration app for macOS that works for Fantasy, Sci-Fi, and Online.
Just download, unzip, and drag to /Applications, then you should be able to:
open syrinscape-fantasy:moods/YnVnYmVhci1iYXR0bGUtaTo6QmF0dGxlIGJlZ2lucw/play/
to start Bugbear Battle - Battle Begins (for example), or:
open syrinscape-fantasy:stop-all/
to stop everything.
The first attempt should show the usual macOS prompt about opening an app that was downloaded from the Internet.
As a reminder, you can download a full list of the remote control links in a CSV from the hamburger menu at https://app.syrinscape.com so you don’t need to copy individual links out of the app.
For Syrinscape Online, change https to syrinscape-online in each remote control link AND append ?auth_token=YOUR_AUTH_TOKEN. For example:
open syrinscape-online://syrinscape.com/online/frontend-api/moods/19/play/?auth_token=YOUR_AUTH_TOKEN
to start Bugbear Battle - Battle Begins for all players in your online session.
This has only been tested on my machine. Let me know if it works for anyone?