Not sure I've seen any analogue joystick like that. Sure, L and R on most controllers (especially GameCube ones) are analogue but not on the joystick trigger.
It sounds like it might be a custom job though.
If you make it yourself, I'd personally use something based around the Atmega32u4 (Arduino Mini, Leonardo, Teensy 2.0 or I think there's an Adafruit one too). There exists the Joystick library (https://github.com/MHeironimus/ArduinoJoystickLibrary) which makes converting analogue inputs to USB trivial, just read in the data and pass it to the library. It will do digital inputs too.
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