Datasette seems like it might be a good fit?
And that they want "a bunch of common graph views I can quickly choose between"
That doesn't sound like Datasette to me, although I'd be happy to be wrong -- how would you recommend someone achieve this in Datasette?
I agree it's not the same as something like superset, but it is still a useful tool that some people might benefit from if they don't already know of it.