its an interesting question.
legally it would be possible, as long as that function is not turned on in the future by apple, or ever able to be turned on by a user.
however, doing that becomes more complicated then just the patent issue. it would (almost) require new pricing (lower) than for the watch that had this function; especially if there are internal transfer pricing issues involved internationally.
and, conversely, selling these watches without this function at a lower price, but then turning the function on later (after the patent issue is resolved) is actually illegal to do unless apple charges those persons who bought the watch at that lower price some sort of additional amount to get that feature at a later date.