I don't know, Nintendo may be not claiming it as policy, but they might let issues like this slide without proof of purchase when a caller "claims" they lost their number. *shrug* I mean, I know we're talking about big bad Nintendo here, but one could hope!
I mean, what purpose does restrictiong the channel even solve? It saves Nintendo some onetime bandwidth in the download process? The thing just sits there if you don't have Wii Speak, right? I'm not entirely sure what Nintendo gets our of restricting Wii Speak downloads.