I am sad that you want to eliminate the jobs of Sheila Jackson Lee, Al Green, Sylvia Garcia and other minorities who are holding offices in order to adopt a rather silly plan that would not work in the real world. These minority candidates would stand no chance of being elected in a statewide race which is why minority majority congressional districts are so important in the real world. Luckily no one would take your plan to be a serious plan in the real world and there is no chance that it could or would be adopted. As a former debater, I was amused to look at your amusing plan and it was clear to me that this plan made no sense.
Again, in Texas county and municipal elections are non-partisan but that does not stop the parties from backing their preferred candidate. The current mayor of Houston is a former Democratic state representative who ran against a candidate endorsed by TFG in the last mayor's race. A number of democrats are lining up to replace Mayor Turner including a Democratic state Senator, a Democratic state representative and other democrats on the city council. There is one former biglaw partner who is running that may fit your criterion, but I doubt that he has a chance. I know about these candidates because I am on their contribution lists (you do not want to see my email box). Your plan simply would not work in the real world and would really hurt groups
Have fun but I will be working on turning Texas blue and fighting GOP voter suppression laws.