Outside Sutera Sanctuary Lodges accommodation, the only other option for sleeping on Mt Kinabalu is Mountain Torq's Pendant Hut. Guests take two of three meals at Sutera's cafeteria, and are required to participate in (or at least pay for) Mountain Torq's via ferrata circuit. Pendant Hut is fairly basic (there's no heat, although climbers sleep in uberwarm sleeping bags).
Pendant Hut
Mt Kinabalu & Kinabalu National Park