The picture you show doesn't show the veneer edge.  Also, does it matter 
if the center lines up?

This looks like one of those dilemmas I often get into where the worry 
is more trouble than the actual solution.  I'm thinking it is the 
outside that is  important.  I would do as some suggested and do a dry 
run without glue, testing surgical hose or stretchy masking tape as a 
clamp around and around the whole assembly.  Cut off the points if they 
interfere with the outside alignment.  You can always smooth out small 
dis-alignment after the glue dries and no one would ever know the 
difference.  Gluing up a half section makes sense at some level but 
practically it is difficult with the kind of clamps we use most.

I doubt my comments are particularly helpful, but it's easy to throw in 
a comment on someone else's problem. :-)

Bill W.
In Beautiful downtown Nottingham, PA