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>nbtstat will reload all of the listings in the lmhosts file, but I think it still won't guarantee that the router won't cache the name. And even if the router or OS doesn't do this now, there's no guarantee that future versions won't. This is an inherent risk with depending on something that wasn't designed to tell you the information you ar depending on it from. (Not that it's a bad idea- so far in fact, its the best idea I've heard yet.)
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>I am really only guessing at the possibility here- and waiting for someone more knowledgeable to confirm or deny my fears.

I would worry more for users behind a firewall or the local DNS server responding. I wish I could set-up a test scenario here to get a real answer.