The problem is, so many Amiga games (at least the ones I like) require keyboard input and/or a mouse too/instead. This is why I think an Amiga-in-a-joystick would fail terribly. An Amiga in a PC keyboard with joystick and mouse ports would be far better and in reality a much more tempting product.
Amiga-in-a-mouse? Amiga-in-a-track-ball? :afro: