It’s not an inconvenience at all, i’m more than happy to help. Put the code directly in the before header hook, no need for Simple PHP plugin. This is how it should look like unless you had some other code there previously.
http://www.zimagez.com/zimage/screenshot-2016-09-19-082327.php
Agressively support the kind of work you want to see. Buy it. Talk about it. Review it.