Not to sound harsh, but I think this sounds incredibly, incredibly stupid. Not saying you're stupid. But how many Brits themselves even try and hide their regional accents with an RP accent these days? You're Canadian, you can't deny where you were raised. Believe me, they'll know if you're putting on an RP accent or not. You'll invariably slip up on something and they'll know you're not British.
It seems fake and reeks of insecurity. There is more than one way to speak English. RP is a very nice way, yes, but if you're a native why are you trying to put on an accent?
I love the Aussie accent but I sure wouldn't kid myself by walking around Sydney trying to sound like Crocodile Dundee.
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Un esprit sain dans un corps sain.