Assuming that your wiki is in English and you have the Translate extension installed:
1. Write a page in English.
2. Mark it for translation.
FuzzyBot will create an /en version of the page that will have exactly the same content as the original one, in English.
/en page says "Translate this page" just like the original. In fact, perhaps it could be a simple redirect, if the /en is really needed.
"This page is a translated version of a page XYZ and the translation is 100% complete."
Well, it is not a translation. Furthermore, if they click the link at XYZ they end up in 'the same page' (to the user's eye). Confusing.