Is it possible to make a swashbuckler/mysterious stranger/sleuth halfling to benefit from a massive pool of resources. Or would this be spread too thin.
Part 2 would the sleuth luck pool be a luck bonus ?
No, I thin they missed the fact that Panache, Luck, and Grit all combine into a single pool. Arcana and Ki are separate (though Ki from ninja and monk stack).
But, don't actually do this! There's no reason to. Panache already regenerates on its own. You don't need a bigger pool, you need to kill/crit more. I could maybe see adding Sleuth just to add more conditions for regenerating your resource, but otherwise, no, just stop.