SteamVRBoolToZinnia.cs

using Valve.VR;
using UnityEngine;
using UnityEngine.Events;

public class SteamVRBooleanToZinnia : MonoBehaviour {

    public SteamVR_Action_Boolean SteamVR_Input_Action;
    public SteamVR_Input_Sources Source;
    [System.Serializable]
    public class Changed : UnityEvent<bool> {}
    public Changed Output;

    private void Awake()
    {
        if (Output == null)
            Output = new Changed();
    }

    private void OnEnable() {
        SteamVR_Input_Action.onChange += InputSource_onChange;
    }

    private void OnDisable() {
        SteamVR_Input_Action.onChange -= InputSource_onChange;
    }

    private void InputSource_onChange(SteamVR_Action_Boolean fromAction, SteamVR_Input_Sources fromSource, bool state) {
        Output.Invoke(state);
    }
}