For the sake of the spacetime continuum, the answer to the first one is probably no.

[The more they tell her and Bart the more they risk changing the timeline. Given that the formerly-known-as-Young Justice Titans were there at certain key events doing certain key things, the risk to the world is huge.]

And the answer to the second one is definitely no.

[A pause.]

But it's really good to see you? Especially with all this magic junk.