Nice little spruce.
I would not remove any more foliage. If possible, try to remove less than 25% of foliage and less than 25% of roots at any one time. Then allow the tree to recover (grow again) before another round of pruning.
I would do the repotting first. Then wait at least one season, until every branch has a lot of shiny new buds growing. I removed about 50% to 75% of the root system of a very root bound nursery spruce. It took 3 full growing seasons for the spruce to recover enough to have new growth on every branch. It was year 4 before the next round of pruning.
Younger trees, such as yours will recover more quickly. But with spruce, you best bet is you repot in your best season (spring or late summer, which ever works for you) then leave them alone for at least one year. Then you prune, and style, then leave them alone a year or two.
You can wire pretty much anytime except spring. Wiring is not that stressful.
Middle to late summer is when routine pruning happens. Ignore suggestions to "pinch" young shoots. When pruning you must leave a bud or more on each branch, or the branch will likely fade away.
That's pretty much all I do with my spruces. I have 3 P. pungens, a P. glauca, a P. orientalis, and a P. omrika. THey are all treated the same.
Potting mix, I use a mostly inorganic mix, some fir bark in it, other than that, pumice and lava. Akadama is fine if you have it.