I'm trying to figure out if there's a way to substitute the first letter of a word for an alternate version. I don't want the rest of the s's in the word to swap also like how standard swashes would work. I'd like it to be automatic so you don't have to hit the alternates every time.
The only way I can think to do it is to substitute the s using the space before the word as a ligature. But that doesn't help when there is other punctuation going on.