I know enough about blades to know whether it's exotic or not. That's not what I am trying to determine. What I don't know is an issue of game mechanics. I'll try to be more clear.
If I wanted to make such a thing how would I do it?
Something like this?
Gun Cane:
Custom Look
Underbarrel Weapon: Snap Blade
Melee Hardening
Is there a better way?
See, one of the problems is that underbarrel weapons mess up your gun cane concealability. I need the blade to be hidden as well.
Fastjack, if I was aiming for effectiveness over roleplay would I really be using a Gun Cane? Lol. I don't usually build characters to be optimal. That's boring. I prefer stylistic unconventional concepts that capture people's attention, but remain realistic to the setting.
And yes, he will be capable of whacking people in the head too, but the knife will still be useful to have. Sometimes as a utility, Sometimes as a weapon.
He'll also have a small spring loaded blade on his wrist, mostly for escape artist purposes. So, if it's not possible to stick a blade on his cane, at least he'll have that.