Question on diagramming a conditional

dazedandconfused-1

This is from PT 46 LR 24.

For this statement "Anything that exists would continue to exist even if everyone were to stop believing in it", I know that to write it in a conditional, it would be:

If exists --> continue to exist even if everyone were to stop believing in it.

My question is on contraposing this conditional. My question is what to do with the "even if" in the negated form. Would this be the correct way to read the contrapositive of the above conditional?

If it does not continue to exist even if everyone were to stop believing in it --> does not exist, or could you also say,

If it does not continue to exist after everyone were to stop believing in it --> does not exist?

I know at this point this is a very cosmetic difference, but something about "even if" makes it sound like you're limiting certain possibilities, whereas "after" makes it more open-ended. I would love to hear some thoughts on this!