Not sure about the other two, but I know of front-line Plt Off SAR mates.
The only way to create them is for a chap to pitch up to a UAS, complete the syllabus (or do enough to get a streaming recommendation)... then fail his degree, apply to the RAF, go through IOT, BFT, AFT and OCU as an Acting Plt Off.... hey presto: you have a ready-made, cheap-as-chips pilot.
Direct Entrants with no previous experience usually have more time to kill completing EFT, that's why they pitch up to a sqn as Fg Offs