I’m not a 777 pilot but my guess is that no wingtip deployment would bring on such a cacophony of visual and aural takeoff inhibits and configuration warnings the likes of which would make a takeoff attempt so unlikely as to say “impossible”. Even in older generation aircraft, V speeds and auto throttles are inhibited and aural and visual warnings abound with an actual flap setting different from that which is programmed into the flight management system prior to takeoff.