As to your first concern, I would not agree to remain friends. I would not be forced to downgrade my M to a friendship. But that's just me. She will need to see you completely gone from her life before she would change her mind anyway. This will let her see what she is missing. Otherwise she gets the benefits of a friendship with you, and what do you get out of it? Nothing.
Me:29 W:27 M: 4 years T: 5 years No children S: 7/7/15 EA: 7/7/15 BD/"I'm done": 7/15/15 MC: 7/7/15-8/21/15 (failed) PA: 8/29/15 W Files for D: 9/9/15 D will finalize in 60 days