Yeah you could probably get away with leadbelcher spray basecoat + nuln oil (or, better yet, a vallejo alternative) + light (!!) drybrushed leadbelcher highlights. I'd probably go over and edge in a brighter silver as well, just to give some definition (i.e. along extreme edges of places where the light would catch).
Cool buy, though. Those are some oldschool 5th edition chaos warriors, which is cool to see. I have a whole army of those guys from back in the day. Keep intending to do something with them eventually.