Huel is healthy, sure; if a healthy diet is important to you it is a good choice. If your primary concern is convenience there are also other options, for example various keto meal replacements or protein powders.
Do you limit your carb intake because you think it is healthier or for weight loss? The latter seems to be the most frequent motivation. Or are there other benefits? You said that your focus was better - do you think a keto diet improves cognitive functions?