I would advise you to contact legal counsel for this- there are many factors involved with state domicile. In the situation you describe, it seems that you are looking at the residency in order to avoid taxes, which is a serious offense (if your other state had a state income tax, this would not be an issue).
Because you INTEND to maintain residences in both places and actually spend more time in Indiana, it could be argued you are not abandoning Indiana domicile. You would definitely want to get the Texas driver's license.
See Full-year residents; "Domicile" defined, 45 Ind. Admin. Code 3.1-1-22
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