First off, please stop using the text with lines thru it. It makes it hard to read and not sure if you really want an answer.
From my understanding, SI will not work with a thru hull transducer mount. People on other kayak fishing forums have had good luck with over the sidw transducer mounts. The bigest problem I have heard is about the drag created when changing spots. This is easily fixed by pulling the transducer out of water. Some just leave it in so they het readings when moving from spot to spot.
Lets us know what you decided to do and hpw it works out. I have not used a fish finder while kayaking but plan on it down the road.