They may be WSOps, in that they wear that brevet (though I'll bet most of them still wear AE and S brevets, in practice).
But they are very specialised roles on 51, requiring long and specialised training (and requiring particular qualifications in the case of one crew 'specialisation') and 51's excellence is very much founded on having a core of lengthy experience in the role - such that when I was writing about 51 a couple of years ago there were still blokes on the unit who'd served on the Canberra and Comet, which were phased out of service in 1973-76!
It would be difficult to 'grow' new crews of sufficient experience, and with such highly-developed skills and instincts, quickly, though one gets the impression that the squadron could operate at least one more jet than it has now....
The unit's previous practice of operating a big, multi-engined type and a smaller one (Comet and Canberra) makes me wonder whether something similar would not be appropriate today. The Canberras (carrying a pilot, nav and single operator (either Sigint or Comint depending on the mission) were used for particular tasks that did not require a Comet, or to augment the Comets, or, it seems, for ops in particular areas, or where higher altitude performance was required, or for 'feints' designed to elicit a response from enemy defences.
A flight of converted Typhoon two-seaters (OK, redundant F.Mk 3s if you must), UAVs or Global Expresses might be 'nice to have' - though I don't see it happening!