You could check out this device: BU0836X 12-bit joystick interface from Leo Bodnar
It allows you to connect potentiometers, rotary encoders, switches & push buttons.
I used it to connect two mini joysticks (X,Y) to move cockpit/camera views. Also I added some rotary encoders and normal switches. You can experiment easily as all connections are through the spring terminals. The best thing though is that is needs no drivers and can be setup directly from MSFS just like any other USB flight control device. If you do use rotary encoders you first need to remember to configure it using the encoder config software from the vendors site (took me a while to realize this). The only slight downside is that there are no outputs for driving LEDs. Also it may seem a little expensive but I think it’s worth it as it is so versitile.
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