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@lpg
Well, if you've ever experienced trying to take off a tightly screwed on cog, you'll see. The maximum force you can apply would be locking the wheel, and even that wouldn't be enough.
Also, you have smaller wheels but a regular-setup chainwheel/cog (compare to buddha's dahon). So, you'll be spin spin spinning everywhere, you won't be able to reach a high enough speed to do it, anyway. I think you'll be fine if you take it up a hill on its first outing. Then again, i've just seen you haven't got any brakes, so your only method of slowing down would be pedal resistance.
If you're worried, get to a bike shop and ask for a bottom bracket lockring. That fits on the same thread as the 16t sprocket, so it should hold it in place.
By the way, if you need to emergency stop (and you plan to keep those pedals), lean forwards as your left pedal is around 6 o clock, then put your right foot on the underside of the right pedal, and you'll skid.