I was able to install the; "Roma surrectum environment submod for Europa barbarorum, to this mod whit no problem.
http://www.twcenter.net/forums/showthread.php?t=415513
The only thing was that that all the text files where it was written in the document; eb, I had to change to xc and that took a while but it worked.
I can maybe upload the text files so that you don't have to change all the ebīs to xc, but I donīt know where I can upload them.