The Yamaha T and HT series engines are generally regarded to be the best kickers and trolling motors available.
I have an 8 hp Honda trolling motor on a boat that I keep on the west coast for salmon and trout trolling. It's a nice engine, but I've fished with many friends with Yamaha's and they are better motors for trolling and for use in emergencies.
The Yamaha T series (and the Mercury Big Foot) were designed to push heavy sailboats. They have heavy duty lower units, low gear ratios, and they turn large diameter low pitch props. This allows them to troll all day at very low speeds as well as providing high thrust when used as a kicker in an emergency.
Horse power is not that important unless you will be running in very strong currents. A kicker won't you much over hull speed no matter how many hp it can produce. An HT 9.9 would be about perfect for a 226.