Can't re-route nav post end-of-game

So, I'm playing a domination game, and the game is drawing to a close. In fact, it has me winning the game in 6 hours. The problem is, I know that not to be the case, as my enemy has a nav that will be re-routing and delaying the end. So I'm trying to schedule a nav re-route that technically occurs post the theoretical end-of-game. This re-route shows up as red in the time machine, and displays as a dashed red line leading to nowhere. And skipping forward in time, the nav does not re-route.
I'd like to think that it's going to happen, but it occurs while I'll likely be sleeping, and is rather critical, as future moves I'd scheduled previously rely on this.
I'd like to think that it's going to happen, but it occurs while I'll likely be sleeping, and is rather critical, as future moves I'd scheduled previously rely on this.