I have been attempting to come up with another solution that gets me a larger set of dice. In another thread, I had a failed attempt using small circle stickers that wound up being just a bit too big.
After these discouraging results, I returned to my earlier idea of making a set of simpler symbols to paint with a Oil-based paint pen directly on the dice. With this method, I also forgo the colors used in the game, since the only repeated dice are "good dice" and "bad dice" other than the force die. These good and bad dice are being represented simply by the color markings. The force die will just use a standard d12 and a chart.
BLACK DICE: Boost (d6), Ability (d8), Proficiency (d12)
RED DICE: Setback (d6), Difficulty (d8), Challenge (d12)
Circles and Triangles: successes and failures
Plus and Minus: advantages and threats
Triumphs and Despairs are made by combining the symbols (see top middle).