You don't even have to do multi colored dice at that point. You can just have 2 dice and the card. As an example, you could put Bankrupt on 2 and 12, Lose a Turn on 3, and so on.
Yes. Your wheel has 11 wedges. (And the seventh is fully 1/6th of the wheel.) Mine has 36. (Or dump the colors, and make it 21, where 1-2 and 2-1 are the same result. Put the bigger money / Million Dollar Wedge / half-cars / whatever the fork on doubles.)
/game maven
If you ignore all the cardboard on the wheel, you only need 11 wedges. (500, 550, 600, 650, 700, 800, 900, Top Dollar, Free Play, Lose A Turn, Bankrupt)
Weirdly enough, having one number be fully 1/6th of the wheel *isn't enough*, since a full *quarter* of the wheel is $500.
If you say "7 = roll another d6 to determine which piece of cardboard you hit", then you can get close enough to the actual wheel layout for a $10 cash-in.
The following chart is close enough to the real thing for government work:
2 = Lose a Turn
3 = Bankrupt
4-9 = $100 x die roll
10 = Random piece of cardboard
11 = Free Play
12 = Top Dollar