You don't say how deep the T extrusion is. If it's six inches deep, you will overcome GBG's objections about insufficient depth to affect stability. However, with a 6" deep keel, you will no longer be able to sail in Assateague with Mike McCrea because the whole dang place is only 5" deep.
Contrary to Marc Ornstein's fears, the T extrusion may strengthen the bottom of your canoe. The only way to test this will be to bash down a 60' per mile descending shallow creek.
Of course you should attach it first temporarily with tape or velcro so you can remove it. This will also allow you to position the extrusion on top of your off-side gunwale vertically to present greater freeboard to an imminent tip. Alternatively, you could tape it on the side of your off-side gunwale to act as an anti-tipping shield.
Finally, you could just lay the enter 14' section horizontally across the gunwales in front of you, with empty 5 gallon plastic jugs hanging off each end. This would act as a Polynesian double pontoon and allow any Magic to surf across the Molokai Channel.
Merry Xmas to all.
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