The term "Shaivite" is overused nowadays. For instance, Iyer Brahmins are often called Shaivites, but they're actually followers of Adi Shankaracharya's Smartha sect (which I discuss here and here) and simply adopt Shiva as their Ishta Devata. True philosophical Shaivism is relatively rare nowadays (in contrast to Vaishnavism which is pretty common). I discussed one genuine Shaivite sect, the Lingayat sect of Basava, in my answer here. But my question is about a more famous sect of Shaivism, known as Shaiva Siddhanta.
Just as the Sri Vaishnava sect is based on the Pancharatra Agamas and the poems of the 12 Alwars, Shaiva Siddhanta is based on the Shaiva Agamas and the poems of the 63 Nayanars. In any case, the standard Shaiva Siddhanta commentary on the Brahma Sutras is the Srikantha Bhashya, which you can read here. As I discuss in this question, it was composed by Srikantha Shivacharya and it advocates a philosophy of Shivadvaita, aka Shiva Visishtadvaita, which is similar to Ramanujacharya's philosophy of Visishtadvaita except Vishnu is replaced by Shiva.
Now the most Shaiva Siddhanta organization is the Saiva Siddhanta Church, which publishes the magazine Hinduism Today. I assumed that they believed in Srikantha's philosophy of Shivadvaita, but their website says this:
There are six main sub-sects in Saivism. The Saiva Siddhanta Church is of the original Saiva Siddhanta expounded by Saint Tirumular, associated with South India. Of the six sub-sects, it is the oldest and closest to the Advaita found in the Upanishads and Agamas. A divergent school within Saiva Siddhanta evolved out of the dualistic interpretations made by the philosopher Meykanda Devar in the Sivajnana Bodham and its commentary, Vartika, one thousand three-hundred years after the original postulations of Saint Tirumular were put forth. This school is also known as Saiva Siddhanta. A second sub-sect is known as the Pratyabhijna Saivism of Kashmir, founded by Vasugupta and known also as Kashmir Saivism. A third Saiva sub-sect is Vira Saivism, founded by Basava Deva in Central India, commonly called Lingayat Saivism. The fourth is Pasupata, founded by Nakulisa and now associated with Gujarat. The fifth is Siddha Siddhanta of North India whose founder is Goraksanath; and the sixth Saiva sub-sect is known as Siva Advaita, founded by Sri Kanta in South India.
So it looks like the Saiva Siddhanta Church believes in a philosophy of Advaita, not the Shivadvaita philosophy of Srikantha.
My question is, what commentary on the Brahma Sutras does the Saiva Siddhanta church subscribe to? Do they believe in Adi Shankaracharya's Brahma Sutra Bhashya? Adi Shankaracharya's commentary criticizes the Shaiva Agamas, so it seems unlikely. And they seems to clearly reject the Srikantha Bhashya. Is there another Shaiva Siddhanta commentary on the Brahma Sutras? The Shaivite philosopher Appaya Dikshitar wrote an Advaitic reinterpretation of Srikantha's philosophy, but the Saiva Siddhanta Church seems to reject Srikantha's tradition outright.
Does anyone know if the Saiva Siddhanta Church has published or endorsed any commentary on the Brahma Sutras?