You can certainly incorporate the insights of Marxism into anarchist thought
Yeah, because Marx never stated anything about the need of a Proletarian Dictatorship, right? Sorry, Marxism doesn't correlate with that of Anarchist ideals. Marxism, itself, points out the need of a State against class antagonisms.
“As soon as there is no longer any social class to be held in subjection, as soon as class rule, and the individual struggle for existence based upon the present anarchy in production, with the collisions and excesses arising from this struggle, are removed, nothing more remains to be held in subjection — nothing necessitating a special coercive force, a state. The first act by which the state really comes forward as the representative of the whole of society — the taking possession of the means of production in the name of society — is also its last independent act as a state. State interference in social relations becomes, in one domain after another, superfluous, and then dies down of itself. The government of persons is replaced by the administration of things, and by the conduct of processes of production. The state is not ‘abolished’. It withers away. This gives the measure of the value of the phrase ‘a free people’s state’, both as to its justifiable use for a long time from an agitational point of view, and as to its ultimate scientific insufficiency; and also of the so-called anarchists’ demand that the state be abolished overnight.”
~Friedrich Engels