Hi Shay - a couple of things come to mind. The first is the relationship between the lower trunk and the rock. It might be nice if there were some movement or interest in this area as it's the most important part of the tree. It sounds like the roots growing over the rock will be nice just below this point, but not sure what to do with this section unless you were open to wiring it into an interesting shape.
In general, trunks are either fused to the rock or growing away from it.
As for the branches above, now if a fine time to select a leader, maybe in light of a decision about movement in the lower section. Either of the three side branches could make good leaders depending on how the tree is wired.
As for buds pushing, I wouldn't expect that unless you cut into the needles (i.e. shorten a branch but still leave some needles that can push needle buds) around this time of year.
Looks like a fun project!