One of the things that impressed me greatly when I used CDE years after using more modern desktop environments was how easy it was to use everything without a m

One of the things that impressed me greatly when I used CDE years after using more modern desktop environments was how easy it was to use everything without a mouse. Modern desktop environments do let you do everything without a mouse, but not use everything: many components are mouse-only, but equivalent functionality is available elsewhere for keyboard users. In CDE, the components themselves were keyboard accessible. Hope this follows the same design, may give it a try to find out.