Hamer used to
mount pickups directly into the wood on some guitars, and they used to use a type of post mounted into the wood, just like your tremolo posts, only smaller. It was a small brass post. Very good idea, but I guess if you wanted the most direct contact with the pickup/wood, screwed right into the wood is the way to go, ala EVH.
Anyway, I don't think you would be doing a lot of unscrewing of the pickups, so I wouldn't worry about it.