Hey sorry for the late reply hope its not too late. Shereton hotel abuja is friendly for overlanders, just have a quick word with the manager and he should let you camp out the back for free, use of pool and facilities also free.
I crossed into nigeria from nikki and across to abuja with no problems. I think southern nigeria is where you get the hassle. Nigerian visa was obtained in Ghana, next day processing for $110 altho I've heard the price varies. Cameroon visa I got in Dakar so no use there I'm afraid.
Safe travels, mike
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