Welcome to our forums.
I am myself from Texas. I live in Grapevine (DFW area)
Although my background is deeper ( piano performance and performance degrees from conservatory in France), I understand where you are coming from. Similar to you, I was a piano performance major both at the University of Kansas and Texas Christian University. However, where we differentiate is that I am a performer and my goal has always been performance
Now, to answer your question, having a performance degree (I am assuming it is your bachelor) is not a problem at all with teaching. Obviously a few pedagogy classes could help, but a piano performance degree is not a problem as far as teaching.
Just take my example. I am a performer with performance degrees and I travel all over the country for concerts and events (a few locations are Florida, California, Ohio, Pennsylvania, Missouri, Kansas, Oklahoma, Texas). At the same time I teach in a private school of music. And I teach over 40 students per week.
This hopefully shows you that you can definitely get your degree in piano performance and still have a busy teaching schedule.
Now a few points:
1. If you look at music school, college jobs and such, you will notice that most of the requirements list a bachelor, master or a DMA. However usually they don't precise what type (performance or pedagogy).
2. Many positions list performance experience and teaching experience as part of their requirements.
As far as schools where to get a pedagogy degree, try North Texas, Texas Christian, Texas.
if out of state, check Kansas, Colorado-Boulder, Youngstown State. If out of country, I would recommend to go to France and study with Herve N'Kaoua.
Where are you in Texas? Who is current teacher? Which universities are you looking at? Which professors?