Difficulty.
The rim is charged and the powder is sprayed, pretty much like spraying a car, then the rim is "cooked", which melts the paint into a continuous coat.
There really is no ...reasonable... way to introduce another color, especially in a small area. My understanding is also that you only want to heat it once, as multiple trips tends to introduce runs and sags.
Your best bet would probably be to PC the wheels, then come back and use either vinyl or have the letters filled with automotive grade paint.
Kirk B.
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