"Maybe a good compromise would be to ensure the children should be guaranteed security- those poor mites didn’t ask for a dope for a dad"
The judgment confirmed that Harry, Meghan and their children are all in the "bespoke" RAVEC category.
Provided Harry gives the required 28 days' notice of his intention to visit the UK, the process will be followed/current threat-level assessed and they all will be provided with the level of state-funded police security that has been deemed appropriate.
It's Harry himself who is arguing that these bespoke, case-by-case assessments and arrangements are not good enough.
Not forgetting of course that if Harry, Meghan and their children were to stay with King Charles or Prince William in the UK, or attend events where they are present, they would benefit from the security arrangements put in place for the more senior Principals (to use RAVEC’s terminology).
I don’t think that Harry being invited to stay overnight in the same residence as his father or brother is very likely for the foreseeable. I think that’s on Harry himself.