Only one I know of that makes spokes for direct replacement is Buchanans. But I don't don't believe they do fatties, you can call them, it says they do custom orders, but IMO for what they charge for the spokes and the spoke spool and labor involved I would just buy some wheels from Ultima. They look great and are very affordable.
IIRC stock wire spokes are butted, in other words the hub end is larger in diameter than the rest of the spoke. If so spokes as fat along their whole length should fit without problems. However you have an offer worth following through!
we coat spokes all the time! and relace. let me knwo if i can help
Have you relaced a set of dna fat spokes. I am in a position to coat a set of these right now but don't want to dis assemble before I know it can go back together. I have read that these cannot be trued. Just wondering if there is any truth to that. PM me if possible