To stay low profile it might be good to develop some missionary work that involves tools useful for other purposes. Maybe some carpentry? Site surveying? Medical? Local transport fir food? Agricultural assistance?
Having medical kits, gps, machetes, cargo truck or even motor bikes would be handy for evacuation yet be useful tools for land clearing, village aid etc.
If they go strictly as preachers and teachers there is not much reason to have a bunch if "tools".