I definitely think she will go down the domestic abuse angle if he divorces her. She has played him like a fiddle in that regard in allowing him to effectively hang himself. He has been open about PTSD, abuse of drugs and alcohol, anger issues. He was the one putting it all out there while she, who was supposedly suicidal, remained suspiciously quiet. For good reason as it afforded her an ace up the sleeve. Whatever she claims will genuinely have leverage because he himself has already portrayed a negative image of himself. Like the narrative outlined in Coutiers about her laying a trail for getting let down by failing staff and having to step down (but the true agenda being to leverage her royal status to make millions in the US), she has laid a similar trail with Harry as well for a failed marriage and for having to divorce.
If she is malignant enough then she'll be able to factor in a whitewashing of her own behaviour, to project it all onto Harry and throw him under the bus e.g. she always wanted to see her father but he wouldn't allow it. Coercive control! She wanted to devote her life to service but he wanted out. Duped! He didn't want to get to know her mothers side of the family. Racist! He threw plates at her during fits of rage. Abusive! He treated the staff like dirt. Bully! He is obsessed with his dead mother and tried to get her to dress like her. Vertigo! He despises his family particularly his sister in law. Jealous! He wanted to invite all these unknown to them celebrities to their wedding. Delusions of grandeur! She always only wanted a small wedding but he wanted the big spectacle with a vow exchange three days before a compromising win for her. Clap back sucka!
The guy won't know what hit him. I think any responses from the Royals were always deliberately done to insert the "much loved family members". A coded message free of any antagonism. They know he is an untrustworthy traitor, an egotistical arsehole, a spoiled prick etc. but they likely foresee the emotional and mental tsunami that awaits him if the scales fall from his eyes which they perhaps have already. Like his ruined Uncle there would be funds made available for him to have a living but in terms of forgiving and forgetting they would be having absolutely none of it.