I am convinced that your methods are GCC legal. For a start canape is not mentioned under 'Disallowed' so it should be allowed. Secondly some players have played canape openings without difficulty.
But the final reason to convince me is that if playing Walsh-type resonses a 1
response to 1
may conceal a much longer
suit. These are certainly legal, so if they are permitted under GCC so are your responses.