If you are savvy and feel its worth the cost, there are keyboards available that are fully programmable, depending on how much customization you need. A Poker 3

If you are savvy and feel its worth the cost, there are keyboards available that are fully programmable, depending on how much customization you need. A Poker 3 would be probably be the best option for something off the shelf, featuring 3 separate fully programmable layers. If you go diy, you can do literally anything.