Don't mess Actions (like estop) and HAL pins. Actions are used to perform sumething in response to user interaction so they are kind of 'output' widgets.
Leds are used to display state of some HAL pins.
I really can not imagine how to connect them...
What's purpose to indicate when ESTOP is _executed_?
Actions are not related to state - they represent some actions, like triggering estop, power, etc
If you need to represent _state_ you need something like halui pins (or use internal GStat object)