Just say your out of State and register online it waives the inspection and they mail you the registration.
You can renew your registration by "self-certifying" as the vehicle owner, that you are entitled to renew your Texas registration, but you and your vehicle are currently out-of-state and you are unable to complete the required Texas vehicle emission inspection (if required by the county your vehicle is registered in). Vehicle emissions inspections are required in the following counties: Brazoria, Collin, Dallas, Denton, El Paso, Ellis, Fort Bend, Galveston, Harris, Johnson, Kaufman, Montgomery, Parker, Rockwall, Tarrant, Travis, Williamson.
You can renew your registration and waive the Texas vehicle inspection requirement either online or by mail.
Online: by self-certifying you are out-of-state
https://renew.txdmv.gov/Renew/RegistrationRenewalServlet