Resetting the Current Page Setup to one "Default" page setup would work.
That was the thinking behind creating the BLANK page setup in the template file.
Its not as efficient as updating the Current Page Setup to the proper setting, but most of these drawings are legacy drawings which will never be opened/plotted again. I just can't tell you which ones those are.
So I can update the drawings right now, because I can delete the old page setups, and import the new update ones. Though I'll probably wait and do it over the weekend just to be sure I'm not trying to update a drawing someone is using.
I was just thinking if the final hurtle could be cleared, my users wouldn't have to do anything when they plot an older drawing.