Thank you both!
Andrew, despite having to run this to update the parameter, the graphic display control is exactly what we’re looking for. It is far easier than trying to control the graphic with the RGB values and the ease of the templates makes the second option the winner.
We note that automatically generated elements, e.g. the wall infill when demo’ing a wall return ‘null’ values. This can be viewed as either a pro or a con depending on what information you’re looking to do.
Thanks again!