Real side handles make necessary tie-down points for transport, and are well worth the cost of adding them if your boat doesn't have them. This is a good model that uses two screws at each end to secure it. Even better, if you can reach inside the hull, use bolts and washers instead of screws. Kayak plastic is pretty thick though, and the screws have not been a problem.
This paddle is nearing the end of its life, so I decided to try an experiment. I added a "drip notch". This is a small sharp-edged notch that the water flow can't follow. Instead it departs the edge of the paddle and falls well outside the boat. I hardly got a drop of water on me.
To make the notch, simply drill a 1/4" hole by the edge of the plastic blade, 6-7 inches from the base. Then file it to the shape you see here, with a sharp corner at the edge. The back-cut assures the the stream can't jump over the notch to the other side.
I can't claim this idea, I've seen a few paddles with this feature.