The EA View method (well MA) ended up working. Thanks.
If I were to do my own version of this (and I might, because that MA View method is pretty obscure) I'd use
http://strategywiki.org/wiki/Dominio...ening/The_Eras instead of an excel spreadsheet. The groundwork's already laid, I'd just have to enter the values, and unlike a spreadsheet it doesn't have to be downloaded.