Exactly. Whether Hockney rhymes with Cockney in my or anyone else's ideolect is irrelevant to the question which I think Myridon's example adequately recognizes. Cockney is not an answer to that question since the words substituted for in Cockney rhyming slang are not necessarily swear words. Of course, neither are the words in Myridon's example, but they're at least leaning in the right direction.