Change project settings? from 32bit to 24bit

So i'm working on some deliverables today, and stupidly enough I had my project settings set to 32bit (for whatever reason). I need to send my deliverables in 24bit, but it is greyed out in the export window. I know i can work around this by rendering, importing and re-render the whole thing in 24bit, but my hope is that i somehow can change project settings to 24bit instead? Its a 90 minute film in 5.1 with stems/dme aswell as m&e renders so I hope I dont need to re-render everything again. Thanks!