hi im not sure what the fuck i found but you might find this morbidly interesting. its called a Canon DK1000i ll USB Keypad Trackball Calculator, and it is all those.
It's housed in a calculator like form factor and it can connect to a pc and be used as a usb numpad.
It also has one of those small solar panel things you can find on low energy calculators, cause it can also be used as a stand alone unplugged from the computer calculator.