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.
http://www.bimoto.pl/index.php?s=1&l=en
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.
Best
rc