Is there anywhere in MN or the surrounding states that even offers GUE classes? I looked and didn't see any. If there was, would there be a decent benefit (to fit the price) to takings the class after doing OW, AOW, Night, deep, nitrox, navigation, wreck, and rescue (all PADI)?
None of those classes focus on the same thing that Fundies focuses on.
As time goes on, though, shops agencies other than GUE are offering similar classes. If you were in Colorado and a couple of other places, for example, you could take a PADI class that covers very similar ground. Some agencies are offering classes they are calling Tech/REc (or something like that) that are also similar. It is hard to find out about such things, though, so you would really have to ask around.