It's not difficult to remove the face from an image like that, so feel free to work from it as a template. Just fill the top/bottom bars to your color choice, recolor the background, fill the rush lines to your color choice after that, and then paste the face on top. I've opted not to do it, but you could also put a player face on the left.
He can't just use the image to display a name. That would mean he would have to make images for every possible name a player could choose- a la completely impractical.
I would say your best bet would be to play with the message options- be those in RMXP and through scripts to see if you can line up a message with the image, and just have the message overlay the "\PN" ontop of the picture with no message backing. You'll probably also need to adjust the positioning of the image and maybe the image itself to make a place for the name to write ontop of, but this is definitely possible, if tricky.