We did get an Omega Supreme back in 2013. I know that it was a redeco of Energon Omega Supreme, but I don't think it'd be much better than a repaint of Cybertron Metroplex. Might as well repaint it as a character that Hasbro has never done and is unlikely to do in the future. Necrotitan would also be cool IMO.Making another Titan would be the easiest because you don't need to replace or sculpt any new parts; a straight repaint should work.
He is currently standing in as http://tfwiki.net/wiki/Grandus_(ROC)
But I was fiddling with him and Sixshot is doable....
Sales thread: http://www.otca.com.au/boards/showth...796#post656796
Support the Hot Shot obsession: http://www.otca.com.au/boards/showth...us-wants-these