Hi Dubbs,
If the excellent advice already given isn't enough, may I suggest that it may be worth contacting 'Mission Aviation Fellowship' to pick their brains about what you need: I'm sure they'll help if asked nicely.
MAF is a Christian missionary bush pilot service providing services to the poor of the Earth in all sorts of rough and inhospitable places. They operate a large fleet of small aeroplanes in developing countries and probably have exactly the sort of experience you need to access. My guess is that they are probably already flying in the area you wish to operate in and will be able to give good advice. Their web-address is
https://www.maf-uk.org › contact-us
Good luck.
BP.