Comment Not this, but there is room for improvement (Score 1) 58
There's an interesting space for a left-hand PC gaming peripheral. Keyboards are OK, but don't have any analog controls, and your most articulate digit(thumb) does the least while your pinky is heavily burdened. The ones I've seen are just half a keyboard made slightly more ergonomic.
I have used a Stream Controller in my left in combination with a mouse. But it's awkward to hold one handed, and it takes a lot of button remapping if the game even supports simultaneous inputs. There was also Microsoft's "Strategic Commander", a joystick with the form factor of a mouse, that I've always wanted to try out.
Unfortunately I think too many people are attached to WASD for anything new to catch on.