[dunstad]

From my personal experience, using such a method doesn't cause problems. I studied the kana using Heisig's Remembering the Kana, where it connects each character and pronunciation to a mnemonic story. I'm long past the point where I actually need the stories to read kana, the sounds are simply tied to the characters now, with the stories available for recall if i have a brain flub and can't remember one for a bit.