Blender 2.8 seems to have it built-in, maybe it’s worth a try “The glTF 2.0 importer and exporter is enabled by default in beta versions of Blender 2.8.”
I’m afraid I don’t have better ideas for now, as I’m not a 3D artist myself 
Blender 2.8 seems to have it built-in, maybe it’s worth a try “The glTF 2.0 importer and exporter is enabled by default in beta versions of Blender 2.8.”
I’m afraid I don’t have better ideas for now, as I’m not a 3D artist myself