Honestly I haven't tried Office Apps, it just seemd like it would be tricky and I didn't have time to investigate. I can see how the local web server hack might work, though. Would it work in the browser and on the Mac?
Depends on how you host the app. If it's hosted locally, then no.
>"and on the Mac"
Maybe. I'm nor that familiar with the Office for Mac features. I did try to search online to see whether Office for Mac supported Office Apps, but it's not the easiest thing to search for.