mock it up on a CAD program on your computer....maybe the VW stud pattern will fall comfortably within the existing 6 holes or even use one or more of the existing holes. In this case you could just leave the excess holes there instead of welding them closed....it's only a buggy

also way lighter than a landcruiser, I can't see a rim buckling in this scenario actually.
edit - my main point here is i suspect it would be easier to mod the rims to suit the VW hubs rather than try to get landcruiser hubs working with the VW axels etc.