I remember when they had that model on Kickstarter - I asked them how a long and well established company like Bike Friday could, in good conscience, use crowd-funding just to launch a new model. They pretty much confessed that they were after "pre-bookings" to make sure it would sell before they went ahead with it.
That being said...
It is a pretty damned expensive bike to begin with, why would you want to cheap-out on a new crankset?
pakiT is marketed as the lightest folding bike out there - and you want to immediately fight to lose more grams on it?
Lastly - I am pretty sure the singlespeed is a belt-drive bike. If I am right - do you have any idea what is involved in changing the crank, or even just a chainring or belt on a drive-train like that? You have a $100 budget? Hahaha - that's a good one...