The Kaivalyopanishat reads like a Shiva-specific one with 'Uma sahayam parameshwaram ....' and also at the end specifies Sri Rudram as the means to attain to the goal. Is this acceptable to Vaishnavas in general and srivaishnavas specifically?
In Vedartha Sangraha by Acharya Ramanuja, Acharya quotes mainly from the upanishads referred in the Brahma Sutra e.g. Brih, Chan, Katha, Taittireya etc. So the upanishads referred to by Sri Bhashya and Vedartha Sangraha are of particular importance to Sri Vaishnavas.
The other Upanishads are not so much integral to the philosophy which is based on the works of Acharya Ramanuja.