I'm on low carb, but not keto, at less than 100g a day.
Some people like to follow DR Bernstein's approach, which is less than 30g a day
www.type1foundation.com.au
The Typeonegrit group on facebook is a group of T1s currently following this approach, but as I don't go that low I haven't joined the group and don't know anything more about it.
If you don't eat carbs at all then you have to start dosing for protein, which is too much work for me.
My dietician claims that if you go very low carb your ratio of insulin to carbs go up, and my breakfast ratios agree with that. My 2g of white coffee needs 1 unit of insulin, whereas if I eat a carby breakfast I use a ratio of 1 unit to 3g....
And I managed my pregnancies on traditional high carb meals (as recommended by the dieticians at the time) with hba1cs less than 48. Admittedly those hba1cs were accompanied by some major hypos, but those were pre cgm days.
As regards DKA, my ketones normally run at levels of about .2, as I'm not in dietary ketosis. It's not impossible to have a DKA at normal blood sugars (google euglycemic DKA) but I think that is normally associated with certain medications (eg flozins).
There is a really interesting article here studying a young German male who went on a ketogenc diet.
Traditional guidelines for type 1 diabetics do not restrict carbohydrates to improve clinical outcomes for patients. This paper highlights the favorable blood glucose control outcomes when a type 1 diabetic focuses on caloric intake from protein and healthy ...
www.ncbi.nlm.nih.gov
It worked very well for him, but obviously this is more of an anecdote than anything else, because N=1 studies don't tell you much other than whether a treatment did or didn't work for one individual.