I concur with broadcast wav. Although I would not use any effects on it. Save the project with a different name, set all the outputs directly to your main and then to the export. You will have to change the type of export to tracks. All the tracks that are mono, select them and make sure you change the other option on the right to mono as well so all the mono tracks are mono. Then repeat the process for any stereo tracks. If it's a pro studio they will probably have better plug ins so why not take advantage of that.
You can export an OMF as well but it's not as reliable from my experience. Although, I'm not an expert. Sometimes it worked for me, sometimes not. You won't get any effects but since you froze your tracks, you will. OMF does not export synths though unless they are frozen.
Good luck