While you can always ask and YMMV really applies for her, I think it is unlikely that Gabriella would allow Greek. She is very open minded in many respects and for me she has been a real GFE many times over, but she has some well defined restrictions that will probably not be overcome by a larger donation.
The best bets for BBBJ and Greek were Joy and Tawny in Victoria, but both are now retired. Reviews indicate that Lexxus (or Lexxy) in Surrey may provide such service.