All RAF SAR training is conducted on the 412 these days and the SAR rear-crew are given dedicated hours to practice cabin entries both on the ground and in the air with both strops and stretchers.
First of all the winchman should always, terrain permitting, have the casualties head on they're left hand side regardless of if they're in a stretcher or in two strops. When approaching the skid, winching should be stopped briefly to allow the winchman to position themselves so they are between the casualty and the the aircraft, the stretcher is outboard with the winchmans back against the skid. Winching is completed to the top of the arm the winch-operator together with limited help form the winchman then pushes the stretcher away form the aircraft and rotates it anti clockwise so the casualties head enters the cabin. The entry is completed by the pilot winching out, the winch-operator pulling, the winchman pushing.
There is no pretty way of doing this but this technique prevents the casualty from comming anywhere near the skid during the final stages of recovery.