And where does this happen? A place with ortho, optho, hand, etc is going to want its residents doing those procedures. And most academic EM attendings are going to act like having ortho on call means that dealing with a fx/dislocation without ortho's involvement is too medicolegally risky. Only places without regular coverage in those areas are going to give EM residents those procedures outside of a dedicated rotation in that specialty.
I'm willing to bet most "low resource" places aren't going to be no volume CAHs but med/high volume suburban sites with specialists that are used to showing up the next day to a gift wrapped patient. If anyone has their definition of low resource, that'd probably help clarify though.