I am not trying to cause trouble but one option would be to dress up the 'civilian' version to replicate a WW2 bike to sample the 'delights' of a small 1940's 2-stroke? As already pointed out by wdbikemad original bikes and parts are getting expensive and well out of the range of us folk who can't afford the real thing but who like riding old bikes. Another issue is that if I was riding a valuable bike I would be reluctant to use it casually as an every day bike for shopping/fun as I do my replica side car outfit.
The big problem, of course, are the crooks who sell replica bikes as genuine bikes. For example BSA Goldstars!