I build and sell dive gear as a bit of a passion/hobby/sideline
http://www.deepdiving.net and my handsets are anodised. I have used both standard and hardcote anodising, hardcote being the most appropriate for my purpose.
Anyhow, I had one batch of handsets that were badly (hard) anodised by a mob here in Sydney, and they were not good enough to sell. I sent them to a specialist hard anodiser in New Zealand who removed the old hard anodising and then re-did them, and they turned out very nicely. The removal of the first anno was done by chemical etching.
I can highly recommend Anodizers Pty Ltd (
http://www.anodizers.com) in Mortdale (Sydney). It's probably worth giving them a call to see if they can do the removal for you.
Cheers,
Jason.