Why a 2-place? There are a number of single-place designs with
removable or folding wings. Bowers Fly Baby, VP-1, Thorp 18...
The Emeraude has an option for removeable wings though it's a
non-trivial operation (ask Cap'n Rich S. about THAT!).

As far as rendering the aircraft unairworthy, a piece of duct tape over
the pitot tube would do it. I like the idea of pocketing the
airworthiness cert, though. :-D