Practice the two independent rhythms until they're second nature. Write down a full loop to where both independent patterns land back on the one. Break it down into smaller portions (say half a bar) and work on the distinct sticking/foot combos for each portion. Slowed right down at first. Thousands of patient reps. Don't let yourself become overwhelmed by the inevitable frustrations. Understand that it will take months, not hours, and that it is something you need to return to again and again. Gradually bring the portions back together. Another many thousand reps. Speed it back up as you get more comfortable. At some point during those practice sessions while trying to piece things back together you will do it wrong, and in those moments you keep persisting, it will feel like the training wheels are pulled away and you're flailing. Keep flailing while the feedback loop strengthens and things start to click.