You could try green smoothies.
They contain all the veg and fruit pulp, so all the fibre.
You can also adjust the recipe since you make it up yourself. The more veg and less fruit, the better.
i haven’t had one for years, but when I did, my blood glucose was fine if I used spinach, courgette, avocado, half a small apple and a handful of berries. Around 80%veg, 20% fruit, and used water as the liquid (not fruit juice!). That would give a 2 or 3 portions, which I would refrigerate and drink within 24 hrs. Lemon jiuce helps prevent oxidation.
you need a powerful blender though.