Is this going to be the only content of the DVD? If yes, you can hit -27 LKFS, and ask the authoring guy to set the dialnorm to -27, or better yet, mix it to -24 that you're used to, and ask for PCM stereo on DVD (not Dolby AC3). If there will be other content, then someone has to level out all the material before authoring.
As for theatrical, you say someone else will handle the surround mix. That means he will be responsible for the loudness. Just make sure they do it at a proper Dolby approved dub stage with the necessary metering options (a Model 737 meter, or a DMU).
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