Great to hear that you’re back! I read the EEVEE-Viewport meeting notes at 2023-03-13 Eevee/Viewport Module Meeting, and am glad that you’re working toward enabling multi-layer workflows.
We just released a beta of our new virtual production system that uses the Viewport Compositor heavily. There is both an iOS app called Jetset (sign up at Lightcraft Jetset if interested), and a desktop side called Autoshot that uses the Jetset-captured data to build a full 3D tracked and composited VFX shot in Blender. (Downloads are free at Lightcraft Jetset).
I already built a workflow with tracking 3D garbage mattes with the Viewport Compositor (Lightcraft Jetset), and then wiring it into the 2D compositor at Lightcraft Jetset), but it would be amazing to have that all wired into the Viewport Compositor in real time.
It’s exciting to see all the viewport & EEVEE-Next work flying along!