I like the pitch, even if I'm not sold on some of the particulars. One thing that stood out to me though: if the Stances basically only really effect one extra ST heal and one GT heal... it seems like it might make more sense for them to be 30s cooldowns that share a recast timer (and probably have a stack or two) that you'd use as a modifier on the Exalted versions to change the effect. Shift it from delay to regen/shield without removing access to your direct heal, and lean in a bit more to being ideal to know in advance what you want to do / what you need like most of the rest of kit is doing.

On the other hand it seems like this might already be a bit saturated with ogcs so maybe not... (though it's not necessarily bad either, could make AST v WHM feel like GNB v WAR). Either way, it seems like a good pitch to keep things similar or similar in flavor, while making the job on a whole more interesting.

Having the support cards directly lead to aoe +damage effects SEEMS like it'd go a long way to making random draws less frustrating, though encounter design would probably need to step up a bit wrt damage to not make playing them in the moment feel like pointless button pressing if you're not playing with someone that's constantly stepping in bad.