I ran across an article while reading about the benz vacuum systems that said it could be done by going though one of the air vents and the glove box. (you might need a 12 year old Asian girl too)
Sorry I don’t have a link
It’s just something I remember reading.

I think there was also something about if you drop the vacuum hose will be forced to take out the dash to get to it, so if this works taping a string to the hose might prove useful