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I don't encounter many with your view. Does that tell you something about your operation. Without wishing to cast any aspersions when was the last time you were audited by external auditors. If the answer is 'never' then you may profit from a firm of auditors with some global expertise having a look-see at how you are doing things.
I have always found external audits to be a valuable way of putting an operation into perspective but don't use those one-day-wonders who parachute in with checklist in hand and disappear without ever getting to the soul of the operation. Use people who have HEMS experience and who speak the HEMS language. IOSA use specialists in each field Ops (planning and flight following)/Maintenance/Ground Ops/Cabin (in your case it would mean a clinician with HEMS experience)/Flight Operations.
G.