I have a couple of ideas, my brother and I were thinking that:
Well, I was thinking that you could have the wither boss on the server, but when the wither boss goes to hit you with its attack, make it so that the damage attack doesn't do any block damage??
Could you also consider about expanding the borders of the member world?
Thank you for the time and consideration to read this topic (its my first one).
~Hammysandwhich