Is this blender unit idea any good?

I'm currently building a list for assimilation swarm and around 2000pts. With my main opponent being orks, I have built a unit which may possibly be a great infantry shredder which will allow my chaff to pick off after they are done.

The unit I have in mind is:

-Tyranid prime with lashwip (Enhancement: instinctive defence)

-X6 Tyranid warriors with melee bio weapons

May I ask if this would be as great as I thought it may be and if it is what harvester models can I pair this up with? If not what may I improve.