iOS has the capability that, when pressing the send button in the Message app, that the last word gets autocorrected, without having to hit the spacebar after the last word. Is there a way to do this for Android, via a messaging app or particular keyboard, or some other means?
Some Android devices auto-correct the last word when pressing the backspace button. So, if you type a word incorrectly and press space and it doesn't auto-correct the last word, you can press backspace and it will fix the error.
But this depends on the model you're using, in fact, some devices do the opposite: they undo the auto-correct.