WeakEventManager for Action<>

Question

I know that WeakEventManager is applied for delegate:

public delegate void EventHandler<TEventArgs>(object sender, TEventArgs e);

However, I would like to use WeakEventManager for Action as below:

public class SourceEvent
{
    public event Action<int, int> MyEvent;
}

public class Listener
{
    private SourceEvent source;
    // Add listener
    source.MyEvent += listener_handler;
    // I want to replace operator "+" by AddHandler of WeakEventManger 
}

Do you have any suggestion for this case. Thank in advance!