For future reference: the Park & Ride & Metro rail (Fannin South stop) worked out just fine. It was only $15 (including rail both ways for everyone in the car), I was able to park very close to the train, the train only went one stop, and the walk from the train stop to the stadium was not very far. All in all, it was almost as good as parking in Waco (but not free) and taking the shuttle to McLane. Not too bad for a city of 4 million.
If I make it to the Ole Miss game in 2020 (likely), I plan to do this again.
“Incline my heart to your testimonies, and not to selfish gain!”
Psalm 119:36