I might be WAY out of line here, but here's my understanding of the new GV stuff:
The 2.7 is still a H27 - this does allow the possibility of a manual.
The 3.2 is actually a GM Alloytec variant and will be all sorts of unique - no manual.
I'm off the the Pines Enduro in a fortnight, if this car is here (as it was last year):

I'll have a chat to the owner. It's running a H27.
Of course anything is possible, but I think you'd be better chasing a H27 than the 3.2 if you want a manual, or else boost the motor in the SWB GV.. Take into account that the 3.2 will be CAN bus and I think you'll be in for a world of pain.
As for the Jimny build, sounds cool.
Steve.