Even if you get it from the embassy in writing, signed, stamped, notarized, whatever, the immigration officer still might give you a hard time.

And even if they let you through in the end, that delay might cause you to miss your connecting flight. As the T&Cs say, you'll have to buy a walk-up ticket in that case.

The way 6E is trying to sell these 6th freedom tickets, it's probably easier and less stressful to book with someone else. And possibly cheaper too once you factor in visa, customs duty, possible walk-up ticket, etc. etc.