I doubt it. Maybe one day, but i've not seen anything yet. Perhaps the old SP2 bluetooth adaptor could work, but i've not seen anyone try.
If it is importance, then for the price of an adaptor, why not just buy a cheap as chips bluetooth keyboard for the meantime. You can get some whi'll take up next to zero space in a bag. Granted it won't be as nice a typing experience as the surface keyboard, but better than nothing if it is important.