I think I might be over simplifying things but i've seen other related threads where it has been mooted that the Sim at benson would have to be transfered to Culdrose and Jungly SK Crews would need training from the RAF to fly the HC variant.
Now then here is a pic of a Merlin HM Cockpit
And here is the HC
Please forgive my ignorance but even to the untrained eye I dont see too much difference between either, in fact I would aver that The HM variant is slightly more complex due to the nature of its task. What would be the problem with taking SK pilots and putting them through Merlin HM Training and then when the time comes deploying them on HC. Same with Ground crew. In fact other than the Rear opening up. the HC variant must be a less complex helicopter.
Sorry for rabbiting on but the debate has piqued my curiosity.