Now I’ve finally understood your usecase.
What you could do:
we’re assuming you have your “corpus” available in some form. Create the frequency list and decide which words you expect to assimilate by reading. You can import them into ReadLang using the Secret .csv flashcard import feature.
You can set up the “Next Practice Date” a year from now (probably with some variation so that they do not enter practice all at once) and set the revision interval e.g. to be two years.
The advantage: ReadLang will think you have learnt and practiced these words already. You’ll be tested on each of these words after a year. If you have assimilated it by then, the revision interval will become even longer, so long that you probably do not need to worry about it too much. If you forget by then, then the revision interval is shortened - I don’t remember by how much or to what default value, maybe Steve will tell us.
Disadvantage: now your WordList view will be cluttered with words you actually do not want to practice. However, you can filter words which are ready for practice and these words will be hidden (until the date for which you’ve scheduled them).