Cleon
Legend
I don't think it should be easy, but he shouldn't have blanket immunity, either.
Would you care to lay out a proposed draft.
You know I'll probably say "but I prefer my version", but it'll help me know what you're after.
First of all, the time stop business is a bit complex and somewhat vague since time stop doesn't work "against" anyone. I'd honestly be happiest dropping that.
It works against time, don't you know.

Then, as for the stuff in the first paragraph, how about we change the immunity to a bonus on saves? That would make it difficult to do anything to him.
IIRC, some of the spells that create those effects don't allow a saving throw, so giving it a bonus on saves wouldn't be much help.
e.g. dimensional lock and dimensional anchor are both No Save spells.