I was playing bandit for the first time a few days ago and realized that neither the katars or the bow allow the use of a shield. So i thought of  an alternative so that the bandit class can still make use of that empty slot. The idea ultimately came down to Quivers, since i couldn't think of anything else.

That's not a terrible idea.  Alternatively, there could be a special kind of shield like bucklers or heavy bracers that ONLY work with Katars and/or bows.