I just wanted to mention that Jeremy ("osgWidget", "osgCairo", "osgPango") has been working on a scene graph named Heirograph with similar design goals. There is already an OpenGL ES2 backend implementation and our goal is, similar to Robert's, to make a Vulkan and a desktop non-FFP OGL3+ or OGL4 backend as well.
It is based on modern C++11 and has a basic model loader based on Assimp. It can even already render some things. ;) There is no OSG-to-Heirograph loader/converter (yet), but Paul Martz already did one of those with his earlier "JAG" OSG3+ scenegraph project, so it wouldn't be difficult.
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