I know that you're trying to make large oceans friendlier for boat users, but maybe in a different way?
Enchanting wouldn't make much sense, so there should be something else. And here it is: Engines.
1. Firework Rocket boat.
You strap 2 firework rockets to a boat and they give you 20% more speed for 3 minutes.
2. Small Steam Engine
You put a furnace and a pickaxe(as rotor shaft) in a vertical line, and above them you put 3 iron ingots acting as propeller. Gives you 8% speed boost, and it will be powered for (Amount of items burned by the fuel) minutes, for instance, 2 Wood planks will power you for 3 minutes, a Stick would power you for 30 seconds, and Coal piece would power you for 8 minutes. Ultimately, lava bucket could power you for hours!