What are the two surgeries? Putting in the DO equiptment and taking it out? Its still sounds better than surgery with possible nerve damage.
An osteotomy is still required. The nerve will be stretched slower, that's true, but I'm not sure if that's the cause of most of the nerve damage associated with lower jaw surgery. Anyway, unless you need over 20mm of movement, no surgeon will distract you if he can do the same in a single surgery.