Been discussed here before. The issue with t tops is where do you stow them? Not much room. The sun roof has been done, there are 1 or 2 here that have them and yes you do sacrifice the spine. I like your idea of a split sunroof, that's a great idea.
I had them on all my Z cars and on my Corvette. I just remember the big issue is where do I stow them. I also remember the ones on my Corvette which was bought brand new always leaked.