I think this may be what you want Brian:
https://www.emshootingsupplies.com/store/p441/5%2F16-27_To_8%2F32_Thread.html#/
I bought one in this configuration several years ago from one of those gun show vendors that sell brushes, tips, patches, etc. You see them at any decent size gun show. But as you say, most are threaded the other way around. The one I bought was aluminum
Alternately, I suppose you could cut the 5/16" x 27 male end off of a junk cleaning rod section, and chuck it in a lathe to drill and tap the other end of the stub to 8-32 female.
