Found a bunch more restaurants which qualify. Not tons, but e.g. there is Turquoise in fresh meadows, Ginger Grill in Riverdale. Madras Mahal (which is apparently a kosher Indian restaurant in Manhattan). DISCLAIMER: I have not independently verified the current Kashrut of any of the aforementioned restaurants.
I havent seen any physical giftcards, but you can just print the e gift cards out on colorful paper, stick a bow on, and most people wont see anything beyond the $$$$.