So if it's 26" square, on point the square will end up around 37", more if you float it.
What is the diameter of the compass? 12"?
That will leave a border/design/whatever of around 30+/- inches around to get to king size.
I'm not going to be much help, because I'd put more complete MC's in in the setting triangles so it would really make a statement. Actually, I'd probably applique a bunch of smaller ones in each section. It looks like you pieced (?) yours to the background.
It sounds like you have PP fatigue so that's not an option for you.
I just think that beautiful, lonely MC is going to get lost in the center of a 95" square quilt (or whatever measurements you're working towards).