Maybe it's possible to request for change name just for that one character 'c' into 'x'. Just a thought though.
The proposal for a change of name has been discussed a long time ago and they have already sent the PM to Theymos, but so far he hasn't obliged. A few member's successfully got their usernames changed recently, but eXch representative here is yet to be successful on that. If they don't mind, i would like to know what Theymos' response to the request was, is it something he considers doing later or was the PM ignored.