Tough news, hope it all turns out ok.
Re: Yaoundé, I don't know of anyone there but if someone can come up with an contact, the first place I would have them check is the Presbyterian Mission (N04°52.783;E011°31.346).
A fairly common stopping place for over landers and if he didn't stop there, then the people passing through may have bumped into him on the overland path. The pictures you provide of him and his vehicle will be a good trigger for the old guy that runs the mission and for the travellers.
Other than that, I would hope the family has put a stop to the cash withdraws and if he is accessing his bank to draw down funds for a significant vehicle repair, that should hopefully lead to a call to his bank or family to see what is going on if he is able to do so.
Fingers crossed everything is ok.
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