Oh, I didn't realize it'd take scripting, which I have no idea how to do, lol.

 The thing is I'm doing this as a product to sell in the store, for others to apply, so unless I can distribute that script, I'll just forget it and include the photoshop layers along with a tutorial on how to apply it to your own textures and how to postwork it too. Much less convenient, but what can ya do.