CBW,
Now that Caverton Helicopters is starting to fly out of Lagos, maybe you could give them a try. They don't have oil company contracts so maybe they would offer something to you. There's been a bit of publicity, both good and bad, about them on here, but nothing ventured, nothing gained. They have an application form on their website:
www.caverton-helicopters.com or you could try their new Ops Manager,
[email protected]
Good Luck
MM