If the Commando Sea King fleet is rapidly re-roled to either/or both Merlin/CH47 on arrival of the current established Merlins in theatre, then a combination of the SAR and SKASaCs will be able to form a training pipeline
The trouble with that of course is that the SAR and ASaC pipeline is currently toppers with both Squadrons spinning plates trying to train and regenerate crews in Afghanistan..... If you want that plan to work then you need to withdraw the Bags from Afghan and thats not going to happen.