As a type 1, I am eating approximately 150g of carbs a day, however in terms of pre-diabetes; the less work you give your pancreas the longer your body will produce those beta cells, so I would suggest that low carbing is definitely worth it. Ultra low carb is just an extream of low carbing, not sure how healthy it is long term. I have never tried it, but a lot of people say its worth it. Breakfast is easier to solve: try making your own muesli if you don't mind fibre or have a high protein breakfast i.e. bacon/sausages/tomatoes/ham/cheese/milk/yoghurt and/or make your own low carb bread.
Muesli I Made
