I just dug through the offerings of all of the niche calculator manufacturers I can think of and came up empty handed. What I would recommend in your case is the Casio fx-CG50, though. It has rubber pads on the back of the case and enough heft that it doesn't move when placed on a desk and used one-handed. The screen is easily visible from most angles and it has the largest font of all of my graphing calculators.