I'd rather not drop it, as it's probably his second most used weapon after the pistols (based on his fights as the Star Wars version), but I'd be happy to turn it down to just being painful/distracting. Will that work for you?

Edit: If the grip of your sword is made of a non-conductive material, that would insulate him from the electricity anyway when he blocked it, so I'd have to actually score a hit to cause electrical damage.