MAF or missionary aviation fellowship (magendo air force if you speak swahili) are always looking and the ipa in uk have their details. try ipapilot.com.
ususally png or east africa. need to be a happy clapper if its going to work for you. all bone domes and bibles. didnt used to like left footers (papists) but may have changed. still if its your thing , karibu.
safari njema