I really like the idea of the new seals system, and if they just want to gut all the cards your idea is the best solution, I've seen it everywhere and I thought about it as soon as they revealed the new cards, all of us AST be thinking the same lol.

I will miss the utility from the previous cards but with that simple solution of 3 pairs you can have the illusion of choice
Skill speed card: better for my DRG / BLM
Crit: there you go MNK / BRD
Damage: you are welcome SAM, etc.