So, the pip boy app is pretty cool but isn't really efficient when you're playing (better off going through the in-game pip boy because it pauses the game). However, it would be awesome to have it running on nearby laptop, tablet or even a second monitor.

It shouldn't be too hard to do, you already have it running on the mobile iOS, android and Windows OSs. I can't imagine it's very hard to make the changes necessary to target the non mobile versions (with the possible exception the Mac OS. I'm not sure if there is a simple way to target that OS from an iOS project).