Sounds like this interview really means a lot to you so if I were you, I'd just disclose it to the interviewer. I did this for mine and was told it wouldn't be an issue. It takes a lot of pressure off your shoulders so you aren't harsh on yourself for blocking up on words. Don't ever apologise for stuttering - I used to do this a lot and it can come across as a sign of low self-esteem of not believing in yourself when most interviewers would be impressed by your confidence in embracing it and not letting the stutter stop you from taking up opportunities as you're much more than that. If they have a problem with it then that's their problem alone! Lastly, I feel as though 'good communication skills' is a social construct. My speech therapist would tell me that non-stutterers can be really bad communicators of not maintaining good eye contact nor letting the other person finish talking of constantly interrupting and making it all about themselves. Chances are that most people would rather talk to a stutterer as opposed to a constant interrupter as we are thought to have a lot of empathy and patience, therefore equating to us of actually being seen as a good communicator. Remember that good communication isn't just verbal. It's about good posture, gesture, laughing when appropriate, relevant facial expressions, not rushing the other person, displaying empathy, etc. as well that I'm sure you're more than capable in showing!