The OG thumb strap
this
This
THIS
I FINALLY got this in the mail and yeah, WTF Nintendo!?
THIS is what should have been included instead of your stand. All that mockery, puzzled looks, manufacturing costs (lol), etc., and the answer was with something you already had from over, what, 7 years ago?
No hand fatigue
No loss of 3D
Just two hands, firmly securing your 3DS while your right thumb adequately enough mimics a right stick. It ain't perfect, but it's miles better than what they came up with
I'm pretty happy right now and STRONGLY recommend this for anyone else who were experiencing issues and, of course, *ahem* checked out my prior thread
EDIT: Let me re-stress that this is to address the concerns of us lefties