A sugar free muesli would be fine? But yep, not the delicious Alpen - although it's only the original one that's delicious now I think about it!
You could make your own using the below ingredients which I've whipped off a website
Grains: Rolled oats, wheat bran, whole rye, whole barley, sorghum flakes, quinoa flakes, millet puffs, millet flakes.
Nuts/seeds: Sliced almonds, walnuts, cashews, pecans, pistachios, hazelnuts, sunflower seeds, pepitas, chia seeds, poppy seeds, sesame seeds, unsweetened coconut flakes.
I'm sure I've seen coconut flakes in a few breakfast recipes so all the above is on plan, give or take
I should go to bed and read soon as well. This pillar isn't easy for me but I'm better than I was