Good luck with that TnTkr, will look forward to your report if you decide go ahead with the Quantum re-programming. I've had to hold back on any tuning mods or suchlike at the moment, due to Honda warranty on my Jazz Sport 1.5. A garage very close to where I live offer a Quantum re-map for both 1.5, and 1.2 Jazz/Fit. My car is also a CVT because my dodgy left leg makes clutch operation difficult. Don't know if tuning or re-mapping will over stress the CVT, as manual gearboxes lend themselves better to successful outcomes.
I suppose it depends on driving styles, and how you apply any additional power. Would also ask if any Jazz owners have tried aftermarket exhausts such as HKS, Spoon, Mugen, and do they improve power, or just annoy with noise?