Thread:Cörey/@comment-29711115-20160821105859/@comment-5811199-20160821112716

An extension called Extension:FlaggedRevs does something similar to what you want - it shows a default revision of a page until a newer revision is accepted by a 'patroller'.

However, I'm not quite sure if it is allowed normally - you will have to inquire about it in Special:Contact/general. It can only be installed by staff as well, via that form.