I recently purchased this quite sorry looking Buxus Harlandi from a nusery I had not been to before. (Thanks Ash for the Jilinda nursery tip

After doing a bit of a clean up and very light trim I'm even more confused with where to go from here. I'll be barerooting this in a cpl days, when I have some
time, and was planning to soak the tree in a seasol bath to try revive it abit... don't know what the roots look like as yet but it will probably go back into a large pot.
The trunk branchs into 3 very large but equal leaders, I'm a little stumped by where to go, can a bixus be heavy pruned almost truck chopped (it has budding low down down on all the main leaders so I might've asnwered that...) or could I jin one???
I'll get some better shots when I'm off the phone and on the computer again, but any suggests so far would be helpful. Thanks