A G5 opponent could be possible, but it would take some wheelin and dealin by Larson to get it done. I think there have been times a school like Eastern Michigan would "host" Michigan but at Ford Field. That way they could count the attendance as their own since they average like 5,000 fans at a regular home game. Kent State or someone would host and be the home team against Northwestern, but at Soldier Field. I probably got my examples wrong, but you get the point. Now those are FBS/FBS matchups, so it would take a unique situation to get a FBS team to be the "home" team at a neutral site in a FCS teams backyard. There has to be some benefit to the other team to do this, and I don't see teams like Marshall, Boise State etc getting anything out of it. Plus there are conferences that have stated rules that you can't travel to an FCS, like the SunBelt for example so that eliminates GSU, Coastal Carolina and ASU. But after looking at the entire list of FBS teams, I did come up with 3 candidates. These three teams are Independents, and have no travel restrictions that I know of.
UMASS- Barely hanging on in FBS. They have $$ issues, and may be open to some sort of shared gate. Also fills a game since they have no conference schedule. I think they have attendance issues, so the NCAA would see this as a home game for them so the attendance #'s are counted as theirs.
NEW MEXICO STATE- Will be soon kicked out of the Sun Belt, I think this is their last year. Not sure of their financials, but unless you are Notre Dame, scheduling as an Indy has to suck.
ARMY- My favorite choice. Army doesn't have money issues or scheduling problems as an Indy, but their football team serves as a recruiting tool for the Army itself. I don't know if they've ever had a game in the MN/WI area. HC is Jeff Monken, he may like another shot at NDSU. Army did play at Yale in 2014.
I don't think the chances are good at all for an FBS school to agree to something like this, but you never know until you pick up the phone.
If NDSU has to bring in an FCS school, an Ivy team would sell some tickets for sure. But their dance card is always full, and they pretty much operate in their own little world. Georgetown out of the Patriot league is a big name in hoops, but they are horrible at FB. Still the name might fool some of the local guy off the street types into checking out the game. Villanova fits the same bill as Georgetown as far as name recognition, but unlike Georgetown they also have a good FB team year in and year out. Then you got Montana, JMU, Sam Houston type teams where there is a bit of a history along with name recognition, but probably would want a return game out of it. In the end if this does happen, I expect an Eastern Illinois or Central Arkansas type team. Not exactly a cupcake, but not anything really special either.
If Larson can pull this off successfully, I'll forgive him for the underwhelming opponent he has for this years home opening of the SHAC.