If it doesn't work for paddling use it for canoe surfing.

All it will do is potentially improve the resistance of the blade as it slices through the water. Much like the big bulb at the bow of large tankers which are more efficient than the knife-blade-bow of old design. Tear drop design is what comes to mind. I'm not sure how significant the "savings" would be. Whatever you may gain in flow, you might loose in the "footprint" as when you look at your paddle from the side, it would be thicker because of the assymetry.
In terms of creating lift you would have to create an airfoil (wing) which is a surface with a curved top, a flat underside and the highest point of your curve on top would not be in the middle but toward the leading edge and taper to the back (think teardrop with one side flattened). Any air or liquid, in our case water flowing over this surface will create a vacuum on top of the curved surface, because the air/liquid moves faster on the flat side.
And right there is the problem because say you poke on the right to make the boat go right. So if you poke right it would have the curved side of the paddle directed toward the boat because that's where it would lift to. Mahalo for the lift, however now you need to poke left and you still need the curve toward the boat to "lift" to the right, but now you have the "wing" backwards and nothing ever "flies" backwards. So the wing just became as efficient as a sack of potatoes and the drag pulling on the paddle is wiping out your gains.
I still like the idea but to be effective you would have to make two. A right and a left hand poke-paddle which still might paddle reasonably, but you are carrying a lot of wood.
In terms of creating lift forward. aint gonna happen. The day it does we'll all be sitting with a beer on the lanai and sending our paddles to do our battles.
My2 cents
Aloha
On second thought: I'm not a steersman but I would look into putting an airfoil perpendicular to a 0 degree paddlers blade(check out flayak.com). With a foil like that you could influence potentially the lift (this time up and down) of the stern of the boat like in a trough for example or force the stern deeper into the trough, and all you would have to do is push the handle forward or backwards to change the angle of attack while maintaining a firm grasp on the paddle. I admit it's wacky because anytime you add anything you pay the price in drag.