some of the phil hubs were coated right? I can imagine that if there was too much paint that it might. You could easily talk to the powdercoater and have them stuff something in there. Or you could file it out on the back end. If they are alloy, you wouldn't have to worry about rust. and the spoke would cover the hole.

I'm going to look into it for an old 2sp bendix auto coaster hub. I'll let you know what I find out.