Westsuits

Would you personally recommend using one (3mm) for Bookookoorara gorge, northern NSW? There is a considerable amount of swimming over deep pools, plus the fact many of them are in shady areas, and carrying stuff, will put the human body under an energy deficit, hence keeping warm is a must for a comfortable hike. You can also add the buoyancy factor of a wetsuit which will ease swimming and therefore energy output will be lessened. Last time (Jan. 2015) I was shivering in Mt Barney's Upper Portals and there wasn't that much swimming, my legs were numb after 4 hours of rock-hopping and crossing short creek sections, and I was as hungry as a wild lion (didn't bring enough food with me
).
I have used a wetsuit before but in Pyrenean canyons which involved abseiling, swimming in dark gorge sections with virtually no sunlight, in water that never sees the sun, basically a damn cold environment. A wetsuit in those conditions is part of essential gear.
Then on top of that, how would you keep yourself warm if one has to do a overnighter carrying an ultralight pack (food, bivvy bag, light inflatable mat, camera). A change of clothes is something I am not too keen to bring because that would mean extra weight to carry, so I was thinking of spending the night with the wetsuit on.
Any suggestions (especially from those of you who have hiked Bookookoorara Ck.)?
Cheers!

I have used a wetsuit before but in Pyrenean canyons which involved abseiling, swimming in dark gorge sections with virtually no sunlight, in water that never sees the sun, basically a damn cold environment. A wetsuit in those conditions is part of essential gear.
Then on top of that, how would you keep yourself warm if one has to do a overnighter carrying an ultralight pack (food, bivvy bag, light inflatable mat, camera). A change of clothes is something I am not too keen to bring because that would mean extra weight to carry, so I was thinking of spending the night with the wetsuit on.
Any suggestions (especially from those of you who have hiked Bookookoorara Ck.)?
Cheers!