Maybe try a non reversing mirror 
Yes, I know what you mean…I was only concerned with wrist and back posture !!!
My problem with the the mirror suggestion is that I have no reflected image at all.
Hmmm… you might want to watch out for that fan coming to get a signature after your concert. That large wooden pen he is holding may not be quite what it seems.
Just a guitar hovering in mid-air?
You just have to turn the mirror around, right?
If you have a tablet of some kind, you can switch the image around if you want and use the front camera to watch yourself as you play, in the correct orientation.
Apparently they sell them on Amazon. They are probably just using two mirror to get a double reflection.
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