Is it possible to display a layer on the slide master from a slide object, possibly with JavaScript?

I'm looking for the ability to create layers on the master and display them from objects on my slides with this trigger on my slides:

'Show Layer (master layer)
When the user clicks (object/icon)' 

The short version: I can display Master Layers from objects that I create on the Master slide, but not from objects I create on the 'working' slides. Is there possibly a way to specifically reference a Master Layer using JavaScript? 

The long version: I have a complex simulation (that will inevitably need to change) that needs to be available on all slides. So I put it on a new layer in the Slide Master, along with an icon on the base Slide Master layer that calls/shows that complex layer. This works fine on my slides. Cool!

However, I have some slides with full screen images that cover the calling icon on the Master base layer, so I copied the icon from the Master base layer to display on top of those images on certain slides. But when I try to access/display the Master simulation layer from that slide icon, it does not appear in the list of available layers. Is there possibly a way to specifically reference a master layer using JavaScript? I think that would do it but not familiar with Storyline JavaScript references.

Searched here but nothing specifically related that I can find.

Thanks!