operate the top manually. It would probably save 10+ lbs.
I haven't found a video on how to manually raise a boxster roof but this writeup makes it appear that it's not feasable on a day in day out basis. I know that on a 996 it's a tedious process. I take it there's no "downgrade kit"...?
As far as weight, I figured it'd be a lot more than just 10lbs, don't convertibles in general weigh between 100-200lbs more than their coupe counterparts?