Combine oats and apple juice in a medium glass or ceramic bowl. Cover with plastic wrap and place in the fridge overnight to soak.
Coarsely grate 1 1/2 nectarines, discarding skin. Add grated nectarine, dried fruit, macadamia nuts, yoghurt, raspberries and two-thirds of the coconut to oat mixture and stir to combine.
Thinly slice remaining nectarine. Divide bircher muesli between glasses and garnish with remaining nectarine and coconut.