Unless the powers that be are going to let them hang at show center doing pedal turns I highly doubt F-35s, the juice won't be worth the squeeze because the TX performance specifications are so high.
The T-X has a minimum sustained g requirement of 6.5g and objective of 7.5g The requirement sets a high bar for maneuverability, requiring the T-X to sustain that load at a pressure altitude of 15,000ft for at least 140˚ of a full turn with minimal loss of energy and altitude. Initiated at or above 15,000ft pressure altitude, at or below Mach 0.9, and at or above 80% fuel weight, the aircraft’s flight path angle during this maneuver can be no lower than 15˚ nose low while losing no more than 2,000ft of vertical altitude and 10% of the initial airspeed.
Bottomline, for a 10th the cost per airframe they can get almost the same show.