Rusty: I don't think you'd get that war club past any airline security checkpoint....the steel in it, ya know.
I have a basket in my front hall, full of sticks I've whittled for myself (bad knees and spine, me) using 3/4" - 1/2" maple, ash or oak saplings that grow on burnt-over forest lands here in Maine. There's lots of glacial rocks, and the saplings grow 'out from under' in nice crooks, which can be cut and whittled into solid walking sticks that are 'integral' , and immensely strong. With 16 to 18 growth rings in concentric circles, they are strong enough to support old legs and shrewd defensive maneuvers alike, yet are light in the hand. Only metal on them is a small screw for the rubber ferrule. And they cost nothing but some whittling time and a few cents for the ferrule and some finish.
An apple branch could be substituted. The wood should be dry.
The cane shouldn't be thought of as a club...but as a lance. Sure, it can be swung, in a pinch...but a two handed THRUST is much more effective and harder to parry or avoid. I seldom go where my metal tools are disallowed, but when I do, I gimp a little more than usual, and make sure the guard checks my 'cane' thoroughly.
The only metal cane that you could probably get past a checkpoint would be one of those telescoping aluminum ones. On those, the handle portion can be loaded with sand, and the detachable crutch tip can be quickly twisted off to reveal a nasty half inch diameter hollow pipe that would be penetrative enough to be effective on soft tissue. An impact weapon in one hand, and a thrusting one in the other.