Forget sweet talk, won't work, and that's me saying this (...).
As long as the invited pax is flying *A, they should allow you in the lounge.
But ordering kosher up front, would be for one person only.
Look on FT for m&m lounge meetings thread, where you can get invited by someone.
Me personally, if not getting kosher, or being into spirits, I wouldn't go all the way to the FCT.
Limo you should also get from other F lounges.