But I guess you can use the second UV set for R/N/M maps. Substance will recognize materials, so if you assign specific Material to specific part, substance can use it.
What you're trying to do is called "NPR" (Non-Photorealistic Rendering), there's a dedicated website with some info on the subject: https://blendernpr.org/category/tutorial/ The method @Jekyll told you is a cool way to get information that's not usually available in nodes, into nodes. You bind a Converter->Combine XYZ or…