The UN Charter of the Seas is just one of the levers that Alberta has at its disposal to get its products access to tidewater. As far as the WTO is concerned, any risk here will be mitigated by membership in the Commonwealth, US support, and demand for our products.
More than that, Alberta has the 3rd largest proven oil reserves in the world, along with extensive forestry, agriculture, and beef exports. Our trade is vital for the well-being of surrounding nations (like America), and the rest of Canada. Any attempt to suffocate our trade would harm prodigious powers on the global stage and will therefore be avoided. Finally, we would be self-sufficient, if necessary.