hi *i am not a doctor* but here are my thoughts - IFing is great, but it's not the be all and end all of life. if you're blood sugar drops precipitously low as a T1 diabetic, that can literally be the end all of life. do not let your blood sugar get to low in an attempt to experience the benefits of IF. you can be extremely health primal, and best buds with grok with out IFing. safety first!!! but to answer the question, yes, you lose the benefits of a fast if you take in either glucose or protein.
diabetics can definitely enter ketosis. i have no idea if it's a safe practice, and wouldn't dream of advising you to do so. you also don't need to be in ketosis for anything - health or weightloss.