I really like Trigger but I would have loved some way to trigger it from the FE, it was a small part of our use case but it sucked having to implement a proxy for it.

We support this but you do need to pass a public access token to your frontend so it's secure: https://trigger.dev/docs/realtime/react-hooks/triggering

If it were possible, how would you have prevented your Trigger account from being abused once a bad actor got its connection details by inspecting your FE app with DevTools?