I've worked on a number of pines that look similar to this one. My approach is to select a branch to become the new leader and then look to see if I can tilt the tree when I next repot to avoid the trunk rising straight up from the pot. Once I've figured out the new angle, I can wire the new leader, if need be, into place.
When the new leader is big enough, I'll remove the growth above it and then let the new leader grow freely to heal the wound left by the sacrifice branch.
Unless I need to balance vigor or generate needle buds, I don't decandle until the trunk reaches the desired size.