How can I change the default text box font in Keynote?

Is there any way to make the default font in my text box something else besides Gill Sans? It sure would be nice to be able to change that per project if I wanted to. It gets time consuming to have to assign a different font style every time I want a new textbox. I know I can make the master slide with text boxes of the rigth font, but that doesn't change the default in new text boxes.