The other races start off with an alignment number, which is not the same as having an alignment. It just means they will respond a certain way to certain things. They still have to research Xeno Ethics to actually gain the alignment.
And they do not have the alignment benefits until they do.
Still have to pay for it, yes. And there seems no way around that. You could give yourself the Xeno Ethics tech, thus saving the time to research it. But that would also cancel the chance to actually choose the alignment, because that choice window is triggered by completing the tech, not simply by having it.
But you know, it is not that time consuming if you focus on research while you are researching it, and if you have several Acadamies built. And once you get the NLC, well, everything else is so much faster that the time lost is gained back manifold.
Some things are better gone about the long way 'round. This is one of them, and it is time well spent.