Tourist,
The 'Beechcraft Comparison' you recommended shows that the ER (Extended range) version has a range of 2806nm, with a payload of 1 crew & 1 passenger - more than enough for any SAR scenario I can contemplate.....
Because for the Crabs to operate a four aircraft training Sqn, they will need Wg Cdr to command it, with around 300 officers and airmen below him (of which 250 would be engineers and around 40 MT Drivers. The remaining 10 would be RAF Coppers - one of which will be a Sqn Ldr, the other 9 would be Cpl's to push the button on the electric barrier into/out of the base). They would need to reopen St Mawgan and then retire the Tutors, Shadow's and Sentinels.
So, looking at 45(R) Sqn, the only comparable King Air driving outfit in the RAF, it's clearly vastly undermanned, with only a Sqn Ldr in charge. I'll get onto Manning at once....