with 6000 hrs jet you should work in Nigeria on the 737 300, you probably will not get anyone to sell you hours. At least you will current, you may do well to buy a session of base training on the 737 somewher, at least you will have flown the real thing, however, you would have to do a couple of sims before they would let you do that I guess.. no .. I have no idea who might give you this, just contact soem TRTOs and find out.. you never know.