Hi kennyeditINDY,
I hope my reply is based on a good duplication of where you are at the moment. With out a scene file this is sometimes not easy. As I’m not clear if the 2D should acknowledge the camera or if the 2D is independent.
The simplest answer would be to place the 2D elements into your Kitchen scene on a separate layer, then render just the 2D elements, which keeps camera and anything in sync.
(As a side effect of this, you might have even the option to use the kitchen geometry as shadow catcher, to “anchor” the 2D parts in a better visual way.)
Eventually, render a mask, so you can composite it in a better way on top of the footage already done. (Light Wrap and edge blur for example.)
Before you convert the footage, based on Rick’s suggestions via SkyBox, you composite these elements. The key idea here is to get the “equirectangular-projection” in a perfect fit to the previous footage.
Any other technique with elements is explained on the Mettle site:
http://www.mettle.com/skybox-tutorials/
Sorry, my three trials with mettle are expired, so I can’t share any scene file.