Boeing pitched an updated Bronco, but remember the Air Force called for a ready to use aircraft.
The Airforce and Marines already have hundreds of Broncos, which is a better plane for the mission than the Super T, stored in Tucson Az. Those planes could be put into service of weeks. Can’t get any more ready than that. There are enough airframes to select the best ones for immediate deployment and send others out to be re-manufactured into an upgraded variant. New production could follow as necessary. No use wasting too much money on these types of aircraft . It’s better to have lots of planes at as inexpensively as possible because as soon as even the Taliban stone age types in the Pashtun get even the most rudimentary shoulder launched SAMs they are toast. FWIW, there are about 10,000 French made Libyan SAMs that went missing and and now in the hands of Iran or terrorists