I'd call Tommy @ USACG (USA Custom Guitars).
http://www.usacustomguitars.com
He'll do clay dots, and he'll match any specs you want. (Warmoth currently won't do 7.25" radius. Tommy used to work at Warmoth years ago.) Tommy will also let you choose the front-to-back thickness at the first fret. Warmoth currently only offers two thicknesses.
I don't think he uses nitro, so my suggestion?
1) Talk to Tommy & spec out your neck, down to the 64th of an inch. He'll hook you up. Order it
unfinished from Tommy.
(Tommy's necks aren't Fender licensed, so he leaves just enough extra wood on the headstock that you can sand it off and make it look legit without Fender's copyright police giving him the smackdown.)
2) Send it to Dan Atkinson (AtkinsonBasses) and BEG him to
finish and relic it for you (since he's no longer currently accepting custom orders.) BEG BEG BEG.
(Dan is on this forum all the time, and is a super-nice guy.)