I ran the PF1 Iron Gods adventure path in which an alien spaceship fleet had crashed into Numeria 9,000 years ago. The PFI Technology Guide associated with Iron Gods had a trait called timeworn in which the alien high technology was barely functional due to age. The degree to which the technology in Iron Gods was timeworn or totally nonfunctional when the party found it depended on the party's level. The writers did not want powerful, functional technological items in the hands of low-level characters, but they were fine with functional technology in the hands of high-level characters because it was weaker than level-appropriate magic items.
I have not yet played Starfinder 2nd Edition (I did run a SF1 mini-campaign), but I read along with the public playtest. Starfinder gear serves the same roles as Pathfinder gear, except that ranged weaponry and flying is more available due to the science-fictional setting. Stay alert for times those two differences could cause trouble; otherwise, level-appropriate technological gear should be fine.
I am confused about adding a 1,000-year-old crashed spaceship to the Jaha setting. Lirgen, the country that founded Jaha, launched its own homemade spaceship, Lirgen's Glory, in 4600 AR, as described on page 202 of the Jaha chapter in Lost Omens Mwangi Expanse. But a thousand years ago, they were not capable of building a spaceship.
Even more exciting, the Lirgeni space program that once seemed lost has been reestablished in the city [Jaha], inspired not only by their nation’s past accomplishments (such as the launching of the starship Lirgen’s Glory at the end of the Age of Enthronement) but by the apparent ambitions hinted at by the many mysteries of Jaha’s architects.