Ok, I understand. The faster way of doing this is to define all the inputs such that the cleared value is also the default. You can then use an invoke node to call the "Reinitialize All To Default" method.
Note that like property nodes, if you don't provide a vi reference to an invoke node it assumes you mean the vi it's installed in.
To create an invoke node to do this: right-click on free-space somewhere in the diagram and select an invoke node from the function menu (look under "Application Control").
After placing the invoke node on the diagram, right-click on the yellow part of it and select "Select VI Server Class>>VI". Finally, right click on the white part of the invoke node and select "Methods>>Reinitialize All To Default".
Mike...