Even though Lomaharshana had not learned the Vedas, Rishis gave him Brahma-sthana in the yajna because of his knowledge and nobility. Rishis have full authority to do such things. They know Vedic principles in depth and never violate them.
Writing down a mantra or a nama instead of chanting it is called likhita japa. Namatraya astra mantra is very effective if you perform likhita japa instead of oral or mental chanting. People fill out books doing likhita japa and keep them at home as an armor.
Story of Sri Yantra - Part 5
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