If you are supoenaed to testify in El Paso and the state wants you there... Yes they can pay for your transportation. A written statement will likely be hearsay and not admissible unless an exception applies. Thus, the state would need the person there to testify.
The information provided is not advice but a legal perspective and you should schedule a consultation with the lawyer of your choice.
They have to be in court in person in El Paso.
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The prosecutor has funds available for transportation, hotel, meals, for out of town witnesses.
The defense can apply to the court for similar funding if the defendant is indigent.
Answers on Avvo are for general information purposes only and should not be relied upon as legal advice. No attorney / client relationship is created by providing this answer. For specific advice about your situation, you should consult a competent attorney of your choosing.