I'm not sure we're on the same wavelength... I think I know what you're saying, but I think there's some tangent you're going on...
The "weapon" options for a recessive hand will always be a shield or bow or arrow (where shields cannot be combined with a bow and arrow).
I'm talking about when you equip either a bow or arrow in either hand, you expose the "fists" attack power property (1 attack power, 50% hit rate).
Although, if you are thinking of revamping Bows+Arrows to an FF5 style type of thing, that would be interesting, but you should enforce 2-handedness.. though I wonder how that'll work out... because those weapons generally require dominant hands... I'm not sure if there are additional checks with those weapons to begin with..
The only thing worth noting that JCE's hack allowed for Bows+Arrows for all and IIRC that Bows+Arrows did not get penalized when equipped either way.. Yang's attack power is fixed, so that allows for some weapon properties to prosper (race/elemental/status modifers) regardless of power.