Hi! Lots to think about. Didn't mean to be on the attack, just was trying to be really clear on where my brain was at for this and why it wasn't jiving for me yet. I can also see how the qualms I had about the breadth of application aren't your priority, and therfore not an issue.
Initially the biggest thing I like is your point about how the mutual exclusivity plays out in dice pools, especially (but also without) the subtracted dice pool. The other aspects require more thought on how they could be applied. I'll take a look at how Genesys uses the two types of symbols for an example.
Totally different thought- idk how much experience you have doing digital art. If you want help with stylized models of your dice, I'd be happy to come up with something and open source the result.