Load/merge a show file onto a host theater's Ion and preserve their channel patching

We're taking a show to AACTFest competition. The host facility has an Ion and has sent a basic magic sheet defining their fixtures and associated channels. I need to program our show with the offline software (cues and submasters mostly) and load that onto their system. Can I leave out the actual patching and inherit them/merge my show onto their rep plot show with the patches? I have a single 80 minute practice session to get it all right, but I'm also the stage director and technical director so I need to spend some of that 80 minutes outside the booth. I know plug-and-play isn't a reasonable expectation, but I'm looking to bring the best show possible given the competition constraints. 

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