Yes, you can prune the trunk.

Now is not the time to do it - wait until Summer (June) when the plant is really growing at its best.

No, there is no guarantee that new leaves or branches will sprout from the older nodes. Most of the time, a single leader shoots out from immediately below the cut - which is why you'll probably want to chop the trunk waaaaaay down below the leaves. The thicker the trunk, the more likely you'll get more than one sprout.

For a thick trunk, you'll want a porous mix, an appropriately sized container, plenty of light, nutrients, and Time.

Josh