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Just my two cents:
– Css added in SimpleCSS plugin should work nice in the child’s style.css
– Your code on the plugin is not granted to work if you place that on function.php, you should do your testing in a test environment.
But remember that if you just need to to “hide” the plugin to your client/users you can use the mu-plugin folder https://codex.wordpress.org/Must_Use_Plugins