I think that the 'plug & play' nature of the Harvest Hawk concept is where flexibility / agility could come into play.
Thinking about the modules which XIII & 39 Squadrons fly from - IF there was the money to go the way of the Sea Herk, which could be swapped out with a HH kit (Sounding like a Gerry Anderson creation here... Thunderbird 2 / Space 1999 Eagle) - then there could be a way to use the existing fleet in a multi-role manner.
Would it be a dedicated LRMPA? Not the same way that the Nimrod was, clearly.
But paired with an ISTAR enabled RPAS, it could provide a chain from detection, location, ID & prosection.
Pipe dreaming I know. Sorry.