The weapon I am struggling with however is the Kanabo. It is a two handed club used by the Samurai for breaking of bones, as well as the smashing of shields. I am not sure which weapon would be appropriate for this.

Greatclub - I feel this weapon has the look, and the feel, but doesn't really have the impact of a shield shattering club that has been finely crafted and lined with metal studs. Though, the Greatclub does have the weight, coming in at 10lbs.

Mace - Same with this weapon, it's only 1 handed, and it does 1d6 which is a die grade down.

Maul - This weapon is great, as it deals 2d6 damage, it's strictly two-handed, and it has the weight property, coming in at 10lbs.

Warhammer - This weapon is probably the 2nd best choice in my opinion, with it being 1d8 one-handed, and a 1d10 versatile, though it only weighs 2lbs? It just feels light to me.