360 render (but from the opposite side of the camera)

Hey guys,
So I have a project where the client wants to make a futuristic helmet animation on the sphere dome projection screen. Basically like the vegas sphere screen, bt in another country.
Im trying to get my head around how to tackle this. Ive gotten to the point where now I can basically render to texture from 1 camera that’s looking at the helmet onto a sphere, then bake that uv fine. Bt the issue is that I need to bake all sides of the helmet. I tried using Multi camera inside the render to texture node tree, bt I’m finding it difficult to stitch and get 100% right. Any one have any different ideas I might be able to try?