There's no doubt that list of people who have been screwed by the bankruptcy of MtGox/dealings of Karpales is long.

Obviously I cannot help you in anyway at all as I'm thousands of miles away and the people you need to speak with to escalate your claim would be Kraken and/or the MtGox trustee. I wasn't asked for any data from my Yubikey, but I did need it to login to my Kraken account as I had enabled it for two-factor. MtGox I recall used their own similar but different Yubikey for their exchange and as my universal Yubikey didn't work I didn't bother setting up any two-factor with MtGox.

Check the link to the Kraken thread here on the forum (listed above), you'll see that a number of people are having difficulty receiving emails from the MtGox trustee and that if you inform Kraken that you have this or other similar issues, they'll add your name to a list to be taken into consideration when the process shakes out. If that's all you do, at least your name is in the hat and it might buy you some time? You won't be the only person with an 'alternative lifestyle' or 'verification issues' but without sounding trite the onus will still be on you to prosecute your claim with them, you know how officialdom works, if you're not active in the process you tend to get crushed by the gears.

In the meantime, you might strike the mother lode out there in Northern California and all this might just fade away...