Bump, due to lack of response on this forum.

Since you are in zone 7a, I would recommend pruning 50% of the plant and potting it into a 3-5 gallon container, if it's at least 2.5-3 feet tall and then bring it indoors when temperatures start to drop below 60ish. That will promote side shoots and bushiness to keep it a manageable size indoors.

Then what you can do is take the parts of the plant that you cut off and stick them into smaller pots of soil and they will root like mad. When I prune my Cestrum's I always take the stems and pot them - they all root! I would wager some rooting hormone would make the success rate practically 100%! Just keep the soil and the cuttings moist. :)

That is of course if you have the space for them. Outdoors here they tend to grow somewhat lopsided... some stalks will be tall while others short. They practically die back to the ground in winter here in N. FL with no protection and suffer no damage at all when protected, so they are more like a perennial here in warm temperate zones.

You might even try planting some of your pruned cuttings outdoors and protecting them with mulch, straw, plastic and blankets and they just might spring back up for you in 7a. :)

Hope this helps!