Yes: To get additional height (resulting in a more interesting specimen later) carefully insert an adequate stake next to the trunk and tie a lead shoot to it closely, train it up that.

I'm new to this....is the stake something that will be in place for many years? I was thinking of bamboo. Since this tree is a focal point in our front yard, I want the stake to blend as much as possible. Can I tie the bamboo rod directly to the trunk?

Yes, you would tie it to the trunk and leave it for as long as it takes the top to get as tall as you want. You must select a new leader to continue the trunk up higher, keep that tied into a vertical position.