Odessa, maybe, Marfa probably not (though the Dew Line can create some monster conversions). The biography on Wally Scott contains some suggested start-points. Uvalde might be ripe, but there is no towplane there that I know of.
South-central Texas has extremely reliable cu-streets that run forever; up to 2-3, or 3-5 days/week. The prevailing wind is from the southeast, so Refugio, San Antonio, Houston and Austin Clubs are all good possibilities. I suggest contacting Tony Condon for some advice as he nearly made it to the Gulf Coast from Kansas at least once. I think he will affirm that coming from the south provides greater chance of success as he had to wait several months (years?) before conditions were right to try from the north.