No backdoor that I know of, and not really needed. I would call CC Dept directly. I don't think all the CSRs form the other Depts (e.g. auto insurance) have been keeping up on their internal CC news, because a memo was sent two weeks ago stating the removal of the USAA website luv button and the changing (harder) credit standards for the Amex and MC (esp the Amex).
Last week, when my GF called to do some changes to her car insurance she also asked about a CLI for her MC. They guy told her to go online and do it. When we told him it is not possible, he said wait a minute...he went and spoke with his manager...he then came back, apologized and referenced the memos I discussed earlier. I doubt it was intentional and I think these changes are more recent. Just call CC Dept directly and see what they can do. Good luck!