How to use required fields on localised entries?
I don't know if you re-use the fields you're using in that channel in other sections and if you do, my suggestion might not work for you, but here's what you could do:

Set all fields to be "not translatable" and if content is entered in one locale it will get synced to all locales. Thereby all required fields will always be filled out and disabling individual "dummy versions" is no problem any more.