Using a demultiplexer to switch controller inputs.

βeta

ModRetro Legend
Basically, I'm making a multisystem. I want universal controllers for 3 systems. I have 20 inputs on the controller, and I want to be able to switch them all to each controller board. I'm thinking a demultiplexer is the best way to do this. Am I wrong? Are there any demuxes that are say, 5x 1:4, so I wouldn't need a bajillion to switch all 20 signals?
 
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