As @AkosLukacs says, the MDBT42Q has 3.3v inputs, so you just need to connect the line that says 5v on your joystick to the 3.3v pin on the MDBT42Q.
There's nothing 'smart' on the Joystick board - it really is just potentiometers so will work just fine off whatever voltage you supply.
Awesome thank you both ! It works like a charm.
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