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I would like to know if they still make something like this. I think something like this came up on ebay recently?
RotaFix the cog and buy some JBWeld.
check out chucksbikes.com. He has the fuji track pro for $650usd. I'm not sure if he will ship intl but it doesn't hurt to look.
I run a fixed gear with no lock ring but i hold the cog in place with JB weld. Imho you should have something holding the cog to secure it.
You can do it. Do not do it through oakley unless you want to pay $$$$. Go you your local optician and see if they can do it for you. I believe...