For Paladin this would be a little less elegant, but still a reduction in hotbar entries. You could have three buttons, one for Fast Blade-Savage Blade-Rage of Halone, another for Fast Blade-Riot Blade-Goring Blade, and another for Fast Blade-Riot Blade-Royal Authority. That's still a 50% reduction in entries on your hotbars.

Other Jobs, feel free to share how you think it would work/not work for you. With the limited time I've played it, I feel maybe it wouldn't be quite as beneficial for Samurai. I don't know.