You're making a lot of assertions here that are really easy to dismiss.

> It tells us that (large-scale) existence is a requirement to have morality.

That seems to rule out moral realism.

> That implies that the highest good are those decisions that improve the long-term survival odds of a) humanity, and b) the biosphere.

Woah, that's quite a jump. Why?

> So yes, I think you can derive an ought from an is. But this belief is of my own invention and to my knowledge, novel. Happy to find out someone else believes this.

Deriving an ought from an is is very easy. "A good bridge is one that does not collapse. If you want to build a good bridge, you ought to build one that does not collapse". This is easy because I've smuggled in a condition, which I think is fine, but it's important to note that that's what you've done (and others have too, I'm blanking on the name of the last person I saw do this).