Don’t worry about the nunchuks. Just get a handle, drill a hole, add a chain , and on the other end, place a two inch steel nut.
You now have a nice “Mace and chain” from medieval times.
Even the American Indians made a war club by dropping a rock in a flexible leather sack and fastening it to a wooden handle.
The old timers knew of a great weapon, they would place gold coins in a deep leather bag, grasp it by the neck, and if someone gave them trouble it suddenly became a black jack. Lead also works.
Roll of quarters in a sock. Very effective.
For unavoidable close quarters confrontation, make fist with car keys in palm, sticking out between fingers. Apply forcefully to brachial plexus or eyes and repeat if necessary.