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I just got a DJ frame that takes nutted hubs.. 10mm axle size.
All my wheels are through axle style.
Is there an elegant/reliable solution to turn my rear say 12mm thru into a 10mm bolt on?
Google is failing me. (rather than threaded rod and farmers nuts)
I have a 10mm RWS thru axle, but I'm not sure it will be resilient enough in horizontal dropout duties.
Looks like this:

I had a 3 speed dt swiss rear hub on a dirt bike once, with 10mm bolt. I would contact DT or a distributor or something
10mm thru axle with threaded ends so you can use nuts. Made from steel if your worried about longevity.
The DT240 singlespeed hubs can be adapted to use threaded bolts, not sure about the standard version.
I've made a 134*11.8 Ali rod with M10*1.5 threaded holes in the ends to convert a 12mm hub to 10mm bolt in. Never had any problems with it if you can find someone with a lathe.