I think there are two more likely options thay unseating Vandy.
1. SVPG's spot. If he is unable to get on the field they will keep Lundt. He might not be a guard but they had tried Grable some at guard and he is clearly the 10th best OL and is a classic Kromer type.
2. They keep a 10th OL.
Unseating Vandy or Vandy being traded is very much 3rd most likely route IMO.
Was in one of Joe Bs write ups and he has been mentioned in a few Astro Notes.
If he shows well in pre-season I think they will find it hard to stash him. And for the reason you said in respect of Vandy I doubt they want to lose Lundt for good.