I think you should be competitive for INSEAD - you have the international experience and background, which would make the culture/people a good fit for you (and also something adcoms will value).
As for applying to only one school, I think in your case you can afford to do that, since you're relatively young and like you said yourself you don't feel this huge need to go back to school (i.e. if you don't get in, you can always reapply next year as well as apply to other schools - or just moving on and not bothering to apply again).
There aren't many other 1-year programs out there, but you can also take a look at LBS as well (greater chunk of the class goes into finance, but it's still a target school for the consulting firms).
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