My understanding was that the g-wagon and the hawkei were BOTH replacements for the land rover... the former for domestic duties and the latter for deployment
Exactly
The G-Wagon was purchased for domestic training only, never to be deployed (because of its poor protection). This reduced the numbers needed for a Hawkei fleet (and hence costs). The Hawkei would only be to deploy. Quite honestly, other than protection, I'd take a G-Wagon every time (if only because I can have a spare tyre without a trailer - I mean, really? An off-road vehicle that needs a trailer to carry a spare? Pshaw). At least the G-Wagon has brakes that always work, good internal space, a body that I can crawl over, and (while eye-wateringly expensive compared to what Mr Takao can buy at the local Mercedes dealership) is much, much more cheaper and cost effective than a Hawkei.
Remember, the Hawkei was conceived when we were planning on fighting some lightly armed and poorly trained insurgents in the MEAO. Not Pacific Islands, not the PLA, not the post-23 DSR Army.