This is going to sound very harsh but I do have YOUR best interests at heart.
I wouldn’t send that communication to an N parent. Although you have every right to set those standards/limits for going forward, I genuinely don’t think pointing out his faults and flaws in that way will get you anywhere.
I can sense the same ‘core wound’ that all children of narcs have in this letter - ‘one more try’, ‘maybe this time he’ll hear me’, ‘if he’d acknowledge it and get help, maybe we could have the close, loving relationship I’ve always wanted/needed’.
Sadly, I’ve had to accept and grieve the fairytale happy ending. My NPD mother isn’t going to change. While change is not impossible in your father’s case, please consider how likely it is that he’ll do those things you’re asking (apologise? get help? stop game playing?).
Unfortunately, ageing narc parents tend to become even more rigid, inflexible and, well, narcissistic.
It’s often said that we can’t change them - we can only adjust our boundaries/borders and the way we respond to them. In your case, I’d consider very carefully how much influence you want your father (with those issues) to have on your own family.
I can feel how much pain and anguish has been caused in the past by your father’s words and actions. Is more pain a price you are prepared to pay for having a ‘closer’ relationship with your father? Is it the idealised loving father you are still seeking? Is it likely you’ll get what YOU need from him this time around?
I’m sorry if this is a negative answer. If you do decide to write, I’d stick to something more like:
When you do X, we feel Y. If you don’t stop doing X, then we’ll hang up the phone/leave/limit our time with you.
I think they call it a ‘connection contract’. Basically setting out the terms and conditions of any contact, rather than demanding apologies and asking the PD’d person to accept/acknowledge their faults, which they simply can’t do (being ‘perfect’ is their disability).
Good luck with finding the right outcome for you.