I would suggest you contact the Dallas District Attorney's Victim Coordinator- 214-653-3600.
Let them know how you feel about the case. They do not have to accept your request for a particular sentence, but they will listen to your concerns.
As Robert points out, calling the prosecutors and talking to them about what you want to see happen is important. They are not bound by your requests but it may change how they pursue the case and what sort of goal they set for the case.
County jail time is only really a possibility if they reduce this charge, and given his record, there's no guarantee that they will do that. A reduction to an attempted enhanced FV assault that gets 12.44'ed or to a Class A FV assault could result in county time; if he's convicted of the 3rd degree and sentenced to time, he has to be sentenced to at least 2 years, but he could be released earlier.