I have toyed with the idea of keto recently, too. (I'm 8.5 months out and loss has slowed considerably and I'm not ready to lose momentum). I've found that googling keto calculator brings up a bunch calculator options that can tell you how many carbs, protein, and fat you should be eating.
Here's what's stopping me, though... true keto is about eating a high percentage of fat and considerably lower percentage of protein. While it will probably help us drop weight, we have to be concerned about our levels of protein because we're already on a rapid weight loss journey and need higher amounts of protein to help reduce muscle loss and maintain satiety. Just some food for thought. Like I mentioned, I'm considering it myself, but seeing the calculators has me concerned because a true keto diet would not allow me to reach the protein goals set by my physician. Realistically, by following a high protein, low carb diet, we can probably already maintain a low level of ketosis anyway, without compromising the extra protein we need to minimize muscle lost.
I also have some reservations about it being a truly healthy lifestyle to maintain long term because of the high percentage of fat (it's supposed to be "good fat", I know, but we know that too much "good fat" is also bad for health) as well as the number of chemical substitutes that people use to maintain the lifestyle.