I found me a copy of Sub Command and it's awesome
I installed SCXII and SCU and everything works, but I'm a little worried about -how- SCU works. The instructions talk a lot about the SCU.exe patching this and modifying that, I'm just wondering if it overwrites any characteristics of the stock three subs, such that I would have to "change back" or uninstall to make them behave properly? It's not really clear and the inclusion of the seemingly redundant Akula II selection in SubChanger makes me wonder. I'd hate to start the Russian campaign and find my Akula has stats of a November!