Perhaps look at how they do the conversion to VP/WP in the upcomming Unearthed Arcana by WotC. That should give a decent indication on how to do it in D20 Modern (and by extension OGL Cybernet).
Course that means spending $30 or so ($60 Australian

) just to find out how to convert to VP/WP. (Course you could always find some other sucker that bought the book and borrow it for a couple of days)
This isnt a huge issue for me cos I'll be getting the book anyway (What D&D player could pass up on a book of variant rules?). But if you just play d20 Modern or Cybernet then its going to be much harder to justify the expense (although there are alternate spell systems in the book, which could be handy for D20 Modern).