Congratulations on your new pieces
That sword blade looks to be rather more substantial than most. I am not doubting you, but why do you think Chokwe? This shape of blade seems to be used quite widely in central DRC, and looking at the remains of the hilt I would have guessed first at Bena Lulua (with a wide margin for error).
Maybe you can post bigger pictures and someone might be able to add more.