Any kind of dried fruits can be substituted: instead of apricots, raisins, almonds and pistachios you can use walnuts, hazelnuts, prunes, bananas, etc.
Same thing for the coulis, it can be made with strawberries, blackberries, blackcurrants,... I really recommend you use something slightly acidic to contrast with the sweetness of the nougat.
For the meringue you have two possible methods:
You can choose one or the other. My preference is for the more delicate Italian meringue, more diffcult to do, but much smoother.