In the Benkenmitsu Nikyōron, Kūkai describes exoteric teaching through the Six Perfections and esoteric practice through body, speech, and mind in accord with the Buddha. This does not discard the Six Paramitas; it deepens their practice through the Three Mysteries.
In his Hannya Shingyō Hiken, Kūkai reads recitation and contemplation of the mantra as a way to remove ignorance and realize Dharma in this very body. Wisdom appears in voice, posture, and attention.
At Byodoji, the Paramitas can begin with ordinary acts: offering, cleaning, stopping a harmful word, continuing a short liturgy, and returning the mind to the Buddha with joined palms.