Just be aware that the wizard will change more than just /etc/config/network, so just editing that won’t be sufficient to revert.
Btw, there’s a trick with the wizard: if you’re ever interested in what it’s actually done, load the page with ‘?debug=1’ attached to the URL, and it will stage the changes instead of applying them. You can then view the changes in the UI (top right).
EDIT: ah, I didn’t realise you were on old releases. Most of what I said above only applies to later versions.