ROFLOL I was literally thinking of the same character and wondering if someone did DnD stats for her.
One resource I will mention, is that Volo's offers alternative eye rays. I typically prefer "Mirage Arcane" instead of antimagic fields, because it is more fun and less annoying to work with. But, if any of the traditional eye rays seem too much, you can always go there to look at alternatives.
This seems like it is a really solid plan. The Sidekick rules are kind of perfect for this sort of thing.