You could reduce the height of the number row by half, add that vertical space to the space bar, and turn the spacebar into 3 parts: regular buttons on the wings where your thumbs rest, and capacitive trackpad in the middle.

Add cellular support and I'll gladly toss my smartphone, which I don't use anyway. I've always just needed a laptop, I'm terrible with touch screens, very painful to use. I would carry this around and have a smart watch for basic text / calling, gps