>>4301487I had one of the smallrig cages with a grip for my a6400 specifically for comfort. It worked alright but then the shutter button felt a little too far back, I think it's worth a try and if you don't like it you can return it.
Ultimately though I ended up just upgrading to an a6700 and have absolutely zero regrets, it's fantastic and fixed literally all the issues I had with the a6400, mainly comfort and usability. Never knew how much I needed a third dial but I can't go back to just two now lol.
