There are a few veg items on the a la carte FIRST menu and not remotely the same thing as offered in Y. I'd imagine you could request just the sides which accompany a meat main as well-the FIRST experience is supposed to cater to the passenger. I was surprised on my last FIRST flight that the veg main was a salad with a large goat cheese medallion on top. The veg option in Club has always seemed more substantial and filling than that, usually some sort of pasta dish. You will also have the option of dining in the lounges. In Hong Kong, I recommend you visit the Cathay Pacific First Class lounge where there is a more diverse offering of food at their buffet in the dining room with servers providing table service of drinks. The BA lounge had a separate FIRST lounge within a lounge when i visited several years ago but the food offering paled compared to Cathay's. Have a great trip!