Hi, welcome to the forums!
A Van Veen would cost you quite a lot of dough, for sure...
It would be better to get a French Scrab Kreidler, as they are a bit easier to find and wouldn't cost you a leg and an arm...
Or just wait for something really cool: there used to be a Belgian constructor/racer called Moisson.
A guy came up to our stand recently at a bike expo, telling me he was in the process of building a 10-piece batch of these frames.
This will hopefully be followed up on the website and forum.
(still waiting on his pics tbh...)
Hope you find a nice example