Hmm... it doesn't seem to work - I've just tried tweaking export groups a bit, but all it does is it hides bones from viewport but not from the render. Annoying thing! lol 
p.s. I have made a post on Autodesk forums about the rig showing on render. Open to suggestions in the meantime!
p.s. I have made a post on Autodesk forums about the rig showing on render. Open to suggestions in the meantime!