Use Transparent overlays for texture_pressed property of texture_button

I am trying to avoid the work of creating different pressed state images for my buttons, and I noticed that texture_focused will allow me to overlay two images on the same button. However, I'd like to do this for the pressed state of the button, instead of the focused state. Is this something that can be done in code? I'd like to be able to go back and change my partially transparent "pressed" image, without having to edit dozens of images.