I don't know if the swap can be made but I have a 2003 S withe the pop out cup holders and quite frankly it is a nice design but not as sturdy as it could be. Also, with a cup in there in blocks the vents. With 2 cups in there it seems quite fragile like it might break off.
Would probably be less work to put one of these optional cupholder sections up top then put the a/c controls down near the shifter, like this: (sorry for the huge pic)
If your goal is simply to add cupholders, as an alternative you might consider an Ultimate Cup Holder. A little pricey, but they look good in a Boxster and work well; they don't block the center console.
I had the full size cupholders and ditched them. Please do yourself a favour and stay away from the Porsche cupholders. They are in a horrible position and ridiculously flimsy.
If your goal is simply to add cupholders, as an alternative you might consider an Ultimate Cup Holder. A little pricey, but they look good in a Boxster and work well; they don't block the center console.
Mr. Man
Any chance you have a link? My dual cup holders SUCK. I use tall thermal cups to transport my morning latte from home to the office and there is NO way they would stay in place. Lately I've been getting up early so I can finish the coffee before I leave home. Of course that allows me to drive the S to work for the day....