Yo, Rob (no escaping me anywhere, it seems).

As you might imagine I'm all in for the agbike platform.

These are for the most part "parts bin" bikes. Almost nothing on them in terms of mechanical parts is not shared by at least several other bikes within the marque.

Most of my homework has been on the AG200, but using it as an example if you were to send me a seat I could reconstruct the balance from parts available here in the U.S., where we don't even have farm bikes. The same appears to be true of the Honda and Suzuki offerings as well. Pick the marque best supported in your chosen region of travel and there should be no reason that it will present any greater parts problem than any other choice in bike.

Given that we expend more energy into making a "normal" dualsport more agbike-like for this kind of travel it seems to me that it involves fewer compromises and even a few advantages over the reverse.

Edit:

The XL200 on which the CTX is based appears to be still available brand new in many South American countries.

The DR200 upon which the Suzuki is based is still available new in Oz. A bit unclear how well supported in S.A.

The AG200 is arguably the least sophisticated among them. It's basically a tarted-up XT200, circa 1983, with guards, chaincase, racks and seat. Thoroughly supported in the U.S. and elsewhere.

At any rate the parts and pieces aren't specific enough to farm bike versions to be of issue.