I could look into adding the accordion tabs in an update since this theme uses Bootstrap, I could try this out….which I just made a note to try this. Not sure if I would include tabs or not, but until then, all I can suggest is try different accordion and tab plugins and see if there are others that work out. Regarding the Circumference theme, this one uses Bootstrap version 3 whereas Celestial Reloaded uses Bootstrap 2, so it would be better to base an update on the latter.
As a little note about the future of Celestial Reloaded, I am considering rebuilding it from the ground up and to update everything in it as well add features. Right now I am redoing the Preference theme which will have the accordion feature.