Question is it possible to hold the swords without using grip on the index as it is quite tiresome to maintain a grip on the swords with the knuckles controller.
Boy am I late to this comment. I overcame this issue by altering the controls for the game. Just set the grip touches to grip buttons and delete the actual grip buttons. Done.
My new problem is that the swords are orientated for the Oculus Touch, so they're a pain to swing.