There are no neo 10s that will improve in any way on that design at this time, that I have ever seen. They will overpower the midrange driver and probably mess with the crossover and probably develop a nasty upper bass bump, or at least very probably.
You'd need to find a new mid and a new crossover for it to sound decent and you'd still be better off.
AFAIK, no one has done such a dastardly thing
