Upright swing = shorter driver?

[Threeputter]

I'm 6'3 and I play irons +1/2" long inch 2° upright. I've always hit these irons very well and I have a 16° hybrid that is 41" inches that I also feel comfortable with. However, I am pretty uncomfortable with the driver in my hands. I feel that normal length drivers, 45.5" is what I am currently playing, require that I flatten my swing and I don't feel as comfortable. Effectively, I need two swings, one for my irons and one for my driver. I was recently playing with a friend who carries a 42 inch 3 wood, when I hit it I couldn't believe how comfortable it felt. I felt like I was using my regular swing and could go after it, move the ball both ways, and keep it in the fairway. 

 

I am now thinking that a shorter driver (Im thinking somewhere between 42.5 and 44") may benefit people with upright swings. There just isn't enough room under my hands for a 45.5 inch driver to pass through, so I am forced to swing around my body. For people who swing flat w irons already, the longer shaft on a driver wouldn't seem to be an issue to me. 

 

I know there are a million posts on shorter drivers and pros/cons but I've never read anything related to upright/flat swings and driver length. I also know some people would say to flatten my swing, but I have a very effective swing with every club but the driver and I don't want to mess with it. Please no need to recite tom wishon's writings here. 

I am wondering if anyone has addressed this before or has any experience with trying a shorter driver shaft with an upright swing?

[SavvySwede]

Everyone's swing gets progressively flatter with the longer clubs and shorter shafts are easier to control for everyone. I don't think it has anything to do with height.