Could you do a groove for a c snap ring type attachment. Technically not a threaded barrel but groove would have to be cut. Any other ways around it beside integral.
Threaded barrel Ban would cut way back on suppressor log jam.
Anecdote from another site. Such a weak attachment caused the can
to sail merrily down range, accompanied by an immediate lower sphincter puckering.
I cannot remember if the can was attached via set screws to such a groove ring but it was not
the safer sleeve method that latched firmly behind the front sight, e.g., D.A.Q pistol adaptor or
the M1 Carbine back-of-the-front sight coupling of the flash hider.
Hope this helps. Shoot safely.