LWRP is at a state that is usable for production. So is Shader Graph with a caveat. The 2D renderer is in an experimental state.
If your intent is to use 2d lights and the new SG nodes: (Un)/Lit Sprite Graph, you may want to wait until at least a preview state. From my experience, it can be frustrating chasing down bugs in the experimental packages.
That said, my current project sounds a bit similar, but I have no 2d or 3d lights. The LWRP works well, and HDR also works. Full disclosure, I use Amplify Shader Editor currently for sprite shaders. I plan on switching when the package goes to preview state (provided everything works with the new 2d renderer).
LWRP (Android) with HDR, Bloom. 