Using a basic media, or one containing a large component of a calcium bearing media component, such as gypsum (which is neutral, or nearly so, in pH). Seems entirely unnecessary for Pinguicula gigantea, in my experience. I've grown hundreds, including some from seed, with various media, usually combinations of various inert mineral ingredients. I've grown some exceptionally large specimens, that were grown in no media at all, simply lying in shallow plastic or ceramic containers, where I frequently added water and nutrients.