Did exactly that, some 24 years ago. BIG and 1/2 submerged boulder in our back yard. I built a suspended deck over the boulder, and after drilling the rock and inserting some re-bar into the holes, made some form work, then poured a small concrete footing for a bick column up floor level of the deck.
Filled the brick column with concrete, leveled the top in preparation for a steel pier for the Paramount. Dynabolted the pier to the concrete. Works a treat.
Thermal inertia of the boulder is a non-issue, as it is shaded by the deck and effectively the same temperature an the earth it is half buried in.
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