Hi!
I sent my old spokes and nipples to central wheels in UK, they reproduced them. They worked perfectly and I laced it myself, not very complicated if you have the concept.
If you need old spokes to send to central wheels, I am hapoy to send you a few.
Take into account that there are 4 types, front inner front outer, rear inner rear outer. And the threads and nipples are different from front to rear, so send samples of all of them. Once you have that, many profesionals will do it in a couple of hours. Try a cycling bussiness, they have best tools for that, no joke.
Miguel