Welcome aboard, Ray!
IMO, best way to assure yourself of a local supplier would be to use that Chibi in a rack mount FD setup.
If you review the excellent FD threads here, you shall see ALL the components can be adapted from quite common items.
I would think you could expect an operating speed of perhaps 25-30kph using the Chibi, and get GREAT fuel mileage for your baht!
(I have friends in Chanthaburi, and shipping from there is excellent, so I would expect you would have few problems with outsourced items.)
Here is a European company that markets a reduction unit and chain drive to the crank, for the Chibi.
IMO, MUCH more complicated, yet the primary reduction, AND the retention of the bike shifter capability really provides wonderful opportunity, if you need that hill capability.