Interesting that Crab proposes a 140kt Wessex or Sea King but still wants a level winching platform. Not possible I'm afraid; basic P of F applied to any tail-rotor equipped traditional helicopter should tell you that. The reason current modern SAR platforms hover nose-up is that they are 'kin quick in a straight line compared to the (level-hovering) models of the past. Surely,the benefits of getting to/from the scene ASAP outweigh hovering nose-up during the recovery?
TC is right in that there is no commercial gain in designing a bespoke SAR cab; there a have been very few aircraft (fixed or rotary-wing) designed that do not involve some form of compromise. An interesting debate for another thread maybe?