Is there any way to filter outgoing text, via remote or alias script? Such as when I say something, it instead replaces something in that text with something, via $replace or such on and so forth.

That sort of thing would do what you want. You'd just want to adjust it to suit your needs. This could be set up in a wide variety of ways depending on what you're doing and how many changes you plan to have (few work fine in if/elseif format, many might work better in a hash table).