Sorry but you've just described EXACTLY what I want. A New Krypton where they are living off the tech of their forebearers.
All tech dies.
,,,,,,,,,,
So Clark will see this decay and work to reverse it.
An interesting idea.
In your story, you'd have to develop a plausible reason for the failure of the NK's to have kept their skills. This is only about about 30 years down the line. So how'd it happen?
Unless the first thing they did when deciding to leave NK was to decide to leave the mechanics behind and only take the engineers.
Also, Clark is not particularly a gadget guy, let alone a rocket scientist - so he may not be the best guy for the job. Given what we saw in the show, Jimmy would be better. Plus if you throw in a reversal of the 'Earth sun makes a Superman' theory, Jimmy would develop super powers and so be an even bigger bargain.
But if they do take Clark the story could turn into a lot of fun as he bumbles around.
The other thing to explain in your story: how come, if it's all old K stuff, the tech was still operating so well 30 down the line ?- I thought stuff all broke down every 5 years, or sooner.
c.
