There’s no reason to crosspost to multipl AE forums till you know you’re not going to get an answer.
You got this over at adobe.com:
You simply need more character value and offset animators before the actual randomization and then use group modes like intersect and difference to limit the range of characters that will be usable by the actual type on effect. Sure, one could do it all with expressions as well, but that sounds like the long way round…
Mylenium
bogiesan