they promote from within unless you are very experienced on twins.
That may be the case in some areas, however there is no getting around the 30 hours P1 in class for the ME CRI and even the bigger schools often baulk at 30 hours 'time building' for an instructor to upgrade internally.
We're a medium school and my budget can't stretch that far. I'd be willing to fund (or do) the upgrade to ME CRI but couldn't afford to fund the time building.