I do very similar things manually already. I engine break and apply very light rear break pressure to trigger my break lights, and let off the rear break and reapply it for the “flashing” effect. Once at a complete stop and in neutral I flash my break lights off/on until the car behind me is at a complete stop.

The benefit of this is tool is that it reduces cognitive load while also working in emergency situations where I’m more focused on operating the motorcycle than signaling to others.