With the yellow longchamp I´m also worried about the non-original wheels. I can´t imagine finding deauville/longchamp wheels can be easy.
But, your description of the German longchamp raises some question about it´s bodywork(Is it the same cars as:
http://www.need4speed.at/bazar/detomaso/longchamp10.jpg ?), so I think the Dutch one is still the best bet at this point.
Which brings me to a point that I need to make before asking anything from you as far as inspections go. I need to sell my current classics, before I have the means to do anything about my longchamp obsession, and I can´t imagine it being done until early august the earliest.
If it´s no trouble for you, I´d appriciate it if you could check the car out. But until I´ve sold my collection I would feel guilty about it.
p.s. How is the availability of the chassis parts(bushings, u-joints, etc.) for deauville/longchamp?