The easiest way to do what you want is to use a double pole GFI breaker and wire the split receptacle as a multiwire circuit.

There are no "splitable" GFCI receptacles that I am aware of.

The Canadian equivalent to the NEC is similar in many parts the way that kitchen counter top receptacles are wire are very, very different.

At SelfHelp forums there is a folder specifically for Canadain electrical code.

http://selfhelpforums.com/

And given them details of what you are trying to accomplish.

I believe that there are some exceptions to the need for multi-wired circuits and split receptacles.