I can't help think that the 'traditional' thinking displayed here doesn't quite fit in with the 'step changes' being put in place by MOD. Especially since the types purchased/proposed are already in use for the designed tasks by other organisations, be they civil or military.
I don't think the RAF/Navy/Army has Seakings or Wessex anymore and neither do MOD have a SAR role anymore. What you seem to be suggesting is that only Chinooks or Merlins in these training roles will do...do you need to update your views?