I would have rather supported their airway and respirations that have given the narcan in the first place. I would have bagged, dropped an LMA, or just tubed them depending on their presentation and how far we are from the hospital. Depending on how they were found and what there clinical presentation is they may have earned themselves imaging that is now going to be almost impossible, IV access will be more difficult, and arterial sampling will be near unobtainable. To me narcan is something we start on borderline patients when we don't want to tube in the ED, but either way they are likely to earn themselves an admission. I can only remember giving narcan once in the field and it was on a little old lady who accidently took too many MS Cotins after her hip surgery.
If someone gave narcan prior to my arrival and we now have a combative patient, yes you can give versed but understand that narcan does have some effects on benzodiazepines. You could also consider ketamine or haldol depending on clinical presentation. In the ED if we needed them back down for procedures I would plan on giving 1-2 mg/kg IV or 5 mg/kg IM ketamine.