Only going off my earlier experimentation, Steven, but if you right-click|Edit alignment, you should be able to add a line (or curve) to the front of the zero station without the zero point moving. I believe that leaves your VG intact.
Actually, I just did a very small experiment and it seemed to work okay... Hope it's what you had in mind.
Hope that helps,
Trevor
Civil 3D 2007, SP1a