WI: STOL light fighter instead of Harrier?

How about in the 50's when Bristol are first developing the Pegasus Engine they modify an Orpheus engine as a proof of concept test with the forward (cold air) nozzles of the Pegasus and a single vectored jet pipe for the hot gasses. This is then tested in a suitably modified Gnat. Now as the engine wouldn't have the power to lift the aircraft on thrust alone the play of the vectored thrust is limited to say 20 degrees below horizontal. The aircraft is then show to have a reduced takeoff and landing run despite relying mainly on aerodynamic lift.

Thing with a conventional jet engine modified in such a fashion is that, once the air from compressor is diverted away from the combustors, the engine will loose power - not a good thing on take-off.
Pegasus featured a big low-presure compressor 'compartment', huge compressor blades ('borrowed' initially' from Olympus) providing the air both for front nozzles and for the high-pressure compressor (and further to the combustors and on). This was partially a reason that Pegasus provided about 5 times the thrust of Orpheus.

With that said - how about an after-burning Orpheus for Gnat derivative?
 
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