This may be better in localization or in module development but thought I would start here.

Is there a way to localize the module.css file per portal?  For example in the language localization you get something like resource-portal id -language or something like it each time a language is edited for a portal.

Is there the same kind of processing for module.css files? 

Mike that looks like it might work with some tweaking - i was also investigating the Continer.cs file in the library\ui\containers in the source - I think the way to do some dynamic loading would be to modify the processstylesheets method in that 

Mike looking over the code the method i mentioned looks to be obsolete - so there maybe a better place for that code to be more robust going forward