Welcome to the community. Yeah this is one of my favorite blueprints too.
This helper your referring to would probably be a toggle helper. What you can do is download my 
Press Button - Turn ON & OFF Entities blueprint. Use the button in the Press Button and then use your toggle helper as the Main Entity. That is if you like the button to trigger the Manual Trigger. If you would like it to trigger the Manual Fan Switch then just creat a diffrent toggle helper and use it in the Main Entity of the press button blueprint and then use that toggle helper in the Manual Fan Switch.
Blacky 