This might just be my headache talking, but maybe you can use Applink to work around the problem?
-Capture the Office installation, but don't build the project yet ("main" project)
-create an empty project ("data" project)
-move files from the main project into the data project, until it looks like both will end up <2GB
-add the data project to the main project's RequiredApplinks
-build both
-remember to always deploy both of them