yep, you pretty much have to sacrifice an open end wrench as Jeff described.
One is the jam nut which has to be torqued in tight to the first nut in order to do it's job. Otherwise if only "one wrench tight" both can turn out in unison.
What do you mean when you say you "safety wire on the remaining threads " ?
Sounds as if your wrapping "safety wire" into the root of the remaining/exposed bolt threads.
I do not think I have ever seen a safety wired nut, although they exist.
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