Sounds highly intriguing. Much better than what I might come up with. As a token, a scale can represent just about anything.
Exactly, the dragon scales have a different artwork, so they can represent many things at once.
This is my campaign I mentioned above. I did it for a some kind of competition. It is in Polish, but if You have someone to translate...http://z5.ifrm.com/3...ata_Nemomon.pdf
Generally that campaign is a co-op campaign between players, and they fight together against some great evil. They win and lose together.
If that will help You get some possible ideas, I will translate for You how I have used the tokens:
Varthrax - Place on your space a Distortion card. If there's already one, put it on the nearest free space clockwise.
Grilipus - nothing happens
Cadorus - nothing happens
Dragon Strike - draw 2 more tokens and encounter them all. if you drew yet another dragon strike tokens, draw next tokens.
Dragon Rage - lose 1 life
Dragon Slumber - give that token to another player. During his nearest turn he doesn't draw a token.
The slumber token may looks weak, but it is pretty important, because the tokens usually are dreadful (so giving it to a weaker player may save his life), and because of the three identical tokens rule:
If you drew third token of the same type, this happens in this order:
1) You lose 1 life
2) You place a Distortion card on your space as though like you would just encounter the Varthrax token.
3) You encounter the effect of the token you drew
4) You take the Crown token from the current character and add it to your inventory
5) You put aside that three identical tokens, and your count for them resets to 0.
6) You continue your turn as normal.
Hope this will help You somehow!