I'm glad you figured it out.Well, I could do it by myself finally.
You can edit a custom JSON file in userdata/controller
You have to search and copy the codes from one place to another easily.
Do as Durge advises, then use Voice Commander to activate the buttons. Just think. Eff1, Eff2, nono Eff12....!!@!!I use VR , so I dont use the keyboard, only the wheel and its buttons.