I'm going to just smash mine right above the steering column. Looks like I'll have 40-50% air flow if I do that and I don't have to worry about rigging anything up with PVC. I test fitted it this weekend and it wasn't as bad as I thought it might be. I'll see if a little trimming in there might get me some extra flow.
It looks like a 1 1/4" PVC pipe would work if you go that route. Where you would have to get creative is the attachment from the 2" duct to the pipe. You'll need to either run a 45 or 90 degree elbow down with an adapter to make the pipe bigger on each end to be able to attach the duct. There's not a whole lot of room on the driver side to make this happen but with some creative test fitting, you should be able to get it done. You'll definitely need the gauge bezel removed to do this.
I would zip tie the pipe in place and run the wipers and see if the linkage clears it. Once you find the spot where it clears, permanently attach it and you shouldn't have to worry about interference there again. Just think about future servicing while you're doing it. Will your duct to PVC attachment points be easy enough to get to without major surgery in the future?
