Eisenmann, I really like your idea of using little beads or whatever, or Cantriped's tokens, to track different stats. This is visually intuitive. The only possible problem I can see is that players need to keep track of specific numbers of STUN, for example, to determine whether their characters are stunned (compared to their CON). Perhaps this may be one of those rules that could be eliminated for basic play, but it's pretty basic to the game. Do you use a card for the aquarium stones to show what the pool is, and what is used? It's possible to indicate "if x number of STUN is moved from your pool, you are stunned for one phase," or something like that. What do you do?
The stones are color coded to the highlighted fields on the character sheet - red for Body and yellow for Stun. Being an impromptu hack it didn't remedy as much as it could have. We still had to remember the stun threshold. Your idea for cards as a visual base is a good one. Then the numbers would be right in context.
I want to note that, in my game, characters have relatively low body and stun. Heck, the PCs are skilled normals and most of their world isn't that potent, making the use of stones as a running gauge of reserve pretty easy.