Grizzly,
Why are you concerned with "adequate" aerodromes? Yes you need an adequate aerodrome available within 60min if your not EDTO authorised but the destination doesn't need to be adequate.? You clearly need an alternate though. CAO 82.5 describes some limitations for AOC holders of high capacity ops. If the operation was at night then an instrument approach is required but not by day. Also if a turbo jet (probably not likely if the strip is gravel) you need PAPI or other electronic vertical guidance. I don't think Low Capacity RPT (CAO 82.3) requires instrument approaches available for night ops. Anyway what aircraft and type of operation are you talking about?