I was able to get Jongware's code to work with placed InDesign files, however, I was wondering if there was a way to make this selectively happen on certain Masters? I was trying to cobble together some code to at least have it execute on a single declared Master (“A-Master”, or “B-Master”, etc), but I don't have nearly enough experience with Javascript to know how to get that to work.

Ideally, it would be great if a checklist dialogue could pop up (before the layer checklist) and ask which Masters the layer visibility should be applied to and then it selectively affects those pages with the right Master-page(s) with Jonware's original code.

Is this making sense at all or does anyone have an idea how to get this done?