Use a standard report for multiple different company

This feels like a content pack to me. What I would think you would want to do is to create a content pack like the Google Analytics content pack or CRM Online content pack, etc. Basically, as part of the content pack, you would put in some parameters for what specific data to pull from the overall pool and have some standard reports and dashboards as part of the content pack. Deploy one of the existing content packs to see how it works. Seems like this would be what you want to do. If you could parameterize Organizational Content packs, that would really do the trick as then it would be really, really easy to do this.