How would one make a dual console joystick

Hi there,

I was thinking of making a joystick that would support both Playstation and Saturn. I would use these mainly because I can go from Saturn and then convert to Dreamcast using a converter and everything Playstation output, I can convert to anything else with other converters.

My only concern is how to get this working in the first place. How can the joystick and buttons each send a signal to 2 controller boards without any sort of conflicts or lag?

As anyone tried this before or knows how this would work in the first place?

Thanks

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