Consider a Sword of Spell Storing, and put Ray of Clumsiness into it. Such weapons can hold up to a 3rd level spell, and RoC is only 1st, so you could Empower it.
The spell does a Dex penalty of D6 +1 per two caster levels (Maximum +5). Empowering it can make it instantly disabling to a lot of people. Remember that, while a Ring of Spell Storing always stores the spell at the minimum caster level needed to cast it, Spell Storing weapons don't have that caveat.
So empowered, even at 1st level caster, does a minimum of 10 Dex.
You just need someone to recharge your weapon between battles.
I know that this isn't quite what you were looking for, but it's in the same neighborhood.