dots material option

Call Warmoth for the inside dope. They will be in today. I'm assuming you mean have them drill the holes for you and you fill them yourself. Might be an off menu item, but I've never seen it.

If you're not saying that, then just buy a neck with no dots and drill your own. I've seen people do that.
For what it’s worth, there was no actual clay present in vintage Fender fretboards. Clay is just the color.