Creating a Line Based generic family that replicates instances of a component without an array?

[MMuchmoreEPVRP]

Hello, I am trying to create a family that will act as a stand in for a metal panel wall's finish face allowing me to modify the finish material on a per-panel level while avoiding using split faces or running multiple wall types with different finishes in series.  

A problem I am running into with line based generic models and model-in-place solutions is that when the component is arrayed I can not change the material on a per-component level, even with the paint material tool.  Is there any way to keep the level of editability I need while still using a line based model?  Is there anyway to replicate components in series without the use of an array? 

[ToanDN]

Sounds like curtain walls should be able to accomplish what you are after. 

[MMuchmoreEPVRP]

I have found that curtain walls don't join or interact with basic walls in the way I need them to, they also pose a challenge at windows and door openings in basic walls.

[ToanDN]

Can you show screenshots of joint or interaction, and challenge at doors or windows that you are not happy with?