Thanks for the chance to help. I am an attorney with over 12 years experience. Hopefully I can help you with your legal question.
Once the divorce is complete, you can not go back and modify that process.
So you would need to go back to court again.
Not too complex...actually the process is straightforward. It is not difficult to change your name in Texas for any reason (so long as you are not a felon) But it will require an application (called a petition) to the court AND an appearance with the court. It is not something you need a lawyer to accomplish (you can do this yourself)...but it does require that you
1. Have the petition notarized by a notary public
2. Be present at the scheduled time to provide information to the court on the petition.
Now....you being out of the country presents a bit of a challenge. Mostly since to accomplish this, you will need to schedule with the court to coordinate your personal appearance.
You can certainly contact the clerk of the court for the county where you are a resident of...but if that does not work, you may need to have a local attorney prepare and present this for you to the court. While you would have to pay the cost of the lawyer, as an officer of the court they can likely accomplish this in your absence (to avoid the cost to travel back for the hearing).
BotXXXXX XXXXXne: once the divorce is final, you will need to schedule a new hearing with the court to effect a name change
under texas law.