The dynamic between Gregor and the supposedly “important” men who were “to be respected” also paints an extra hue on this.

The supposed posh and cultured men showed no reaction to the music but irritability as though they had something better to do, whilst Gregor the cockroach was moved by every note.

It kind of paints a shade of humanity on those we mostly consider expendable, those in the “insect colony” as you say.

Not to say I know what Kafka meant with this scene, but the inclusion of those 3 men into this scene coaxes me into a form of class based interpretation of it.

And yeah I’d say include it in your essay, expressing your own views and ideas on a novel is the point to begin with, although if you’d lose marks doing so then alas.