Fonts normally do not contain any color information. So typically, assuming you found a font for signal flags, you'd have to manually convert them into curves and then color them. The font Gord mentions appears to be unique in doing this, assuming it works for you.
Might be less work to find a collection of signal flags, as image files, and then manually drop them into each name badge on top of the name. (Simple image files can sometimes render much faster than PostScript programming, depending on your system.)