If you can find a fish hauler nearby or can haul yourself, I think one of the best forage fish for bass in TX is(are) Tilapia! The fish themselves or their offspring make great forage opportunity. You probably can get a good price on the leftovers in the fall and I believe they will overwinter just fine in most areas of TX. If they don't overwinter, they will get sluggish as the water temps cool which might make them easier targets for the largest LMB.

Outside of that, I'm not an expert on southern ponds but always wondered why folks didn't set up mosquito fish as forage fish. It seems they are found almost everywhere and are pretty hardy even in hot conditions. It seems they could be the forage fish for the south that fathead minnows are in the north.