In France a number of pilots with MCR-01 Club aircraft have build a set of ULM wings (the only difference) and had them reclassified as Microlights. As it takes about 15 min to change the wings, I wonder if you can change category depending on which wings are on?
I assume our PFA/CAA would have 1000 reasons why this could not happen in this country, but I guess you could export one, change the wing and the category and re-import it.
Rod1