Well, you can do some pretty significant reductions of branches in winter as well. This could be a rather elegant, natural looking pine. But I would suggest that you wire the tree to determine what you will actually need for an apex. Wire up fromthe bottom, lolok to where you need foliage to frame the crown, then reduce the largest branches first, leaving the smallest branches that you can effectively leave. Make sense?
The other thing is that this treewill need to be repotted to get asense of how the roots are doing, and a good needle/bud management program implemented to get the foliage in scale. John