Forgot to read the pinned post my apologies for the redundant post
That was going to be my first suggestion, but I see you beat me to it.
That post hasn't been updated in some years though, so this post could be a worthwhile chance to discuss new resources that should be added.
As far as I know, Kagi doesn't have their own index. They use a mix of google and brave's results (maybe some other search engines too?), and then sort their results to give "better" ordered results.