It's fantastic what you are doing - if you are interested in a Japanese language teacher (or maybe ESL) by all means get in touch w/ me.
To answer your question, I think I can point you in the right direction. There is an outright libertarian university in Guatemala: Universidad Francisco Marroquin: https://www.ufm.edu/index.php/Portal
You could try contacting people there - here are a couple to start with as they've already conducted interviews in English about the school:
Giancarlo Ibarguen and Dane Starbuck: http://www1.radiofreemarket.com/2012/07/30/educating-for-lib...
Chris Lingle: http://thestatelessman.com/2012/12/10/lingle/