Pike Cichlids are very different both within their groups aswell as individually. Wether it works or not depends on the animal you get. An aggressive one will easily tear your bichir apart, even if it is half their size. Bichirs having a similiar bodyshape increases the risk by a lot. I once had a harmonating zebrina pair that lived peacefully with everyting that wasnt their shape, one day the female suddenly tore the much bigger male apart. She now lives with alligator gars that dont dare to touch her.
Acutirostris usually works well and is affordable, but I personally would look for sth. else since they do have rather different habitats.