I think the "best" way is to make sure they will stay useful as he builds his force so I suggest plain vanilla x2, and one with a Strangle Cannon..that should run 100 points. They should do "OK" vs
BA as the Strangler gives them some reach.
Otherwise adding in Rending Claws is a cheap
CC upgrade( for two or three), or use one set of Lashwhip, and Bone sword.
Hopefully he'll find a warm welcome from the Hive Mind.