As far as I know, "blade" encompasses even the unsharpened, thrust-only sort of penetrating weapon that's on a CS sword cane. I'd have a hard time making a straight-faced argument to the court that my client wasn't guilty because the item in his possession wasn't, in fact, a "blade." That said, I haven't checked Texas criminal cases or statutes--I could be wrong. You can probably find some sort of definitions section using Google for the Texas law, and then google for Texas cases citing that code section. Someone has almost surely tried this argument as a defense before.
Also, the biased opinion of LE is really all you care about. Just because you'd ultimately prevail on your claim at trial (maybe), you don't want an arrest record, or to spend time in jail, or to have to make bail, or to have to pay the sort of rates decent lawyers charge.
I can't tell just by the side view whether it would feel like my pistol gripped fencing weapons or not. I imagine it would give a better hand position and control than the simple pommel looking sword canes (which would handle more like a french gripped weapon) because it is sorta pistol-shaped... but size of it relative to your hand will make a big difference. There's also no finger hooks or tail that extends back to brace against the inside of your wrist. Best analysis I can give is that it will be like a really long push dagger with a large "half a T" grip, if that makes any sense. Better than a straight grip for a sword cane's main purpose, but I still wouldn't want to fence a duel with one
