Have you considered, maybe building the entire shot in After Effects.
No Video. No Tracking.
Import a Hi Res photo of your room, layout your post cards and add a camera.
Using vanishing point may be cool if you’re room isn’t too complex.
I recall a pretty rad tutorial about how to use VP on either this site or videocopilot.com
You’ll have totally control all of the time.
Add some wiggle to the camera’s properties to get the handheld effect.
You’re vision may be too complex for this solution….but I figured I would through it out there.
good luck.