For EMT level, as long as they have worked at equivalent practice then I don't see it being a problem. If it's not exactly equivalent level then that's fine, it just needs to be substantially similar less any specifics. They'll still need to pass the clinical and operational appraisal to demonstrate this.
For example somebody who hasn't used methoxyflurane or done laryngoscopy before is not really a problem; but somebody who was missing any experience with a number of core medicines (such as GTN, glucagon, salbutamol, ipratropium etc) or who couldn't do basic ECG interpretation or who had absolutely no experience doing clinical decision making around referral would be a huge problem because they couldn't be said to be equivalent.
This is all a bit moot point anyway; the only options for this guy would be to do some weekend events volunteering or maybe, maybe at the absolute very most get a job as a casual PTO but he'd also be competing with all the other in-country folks who would get first preference. Not to be negative but handing out plasters and MOF is probably all he'll get.