I've been told on another board it would be impossible, or difficult as well.
My thoughts were, if someone could drill a hole into the hub and then die a thread into it??
With the bore being smaller, you could lathe a large hole out, as it's covered by the 'hub cap' anyway.
Here's the alloys, I've wanted them for ages (but 'want' and 'get' are two different things)! The front wheel is 6.5 inches, and then the rear one is huge (and has a deeper recess in the alloy).