Location of the control on alt keys
Your best precedent for keyboard layout for this is the Kinesis Ergo Advantage keyboard, which I have been using for nearly 2 decades. One of the great advantages of the Kinesis keyboard is that is loads up both thumbs with the most important keys, including control and alt, and unloads the pinkies, which are the weakest and most awkward digits to use, especially in key combinations, like copy / paste. I want this keyboard / mouse thing to work, because I would likely be an early customer. With many years or experience with a similar key layout, the control keys being a pinky key does not seem like a great solution to me.
From your 'home keys' the ring finger would be on the 'c' and the pinky would have to stretch to control key, which is not anatomically possible. This would force a 2 handed key combo, or moving off of your home keys to do a 'copy' - control + c.
I hope I am wrong, or that this feedback can help.