Well, such a feature, exactly how you described it, does not exist. However, the existing features are likely enough to effectively get what you’re looking for.
First, you probably know about the Resurrect button, which appears at the bottom of each item’s page, after you’ve burned the item at least once.
You might not realize, though, that once you resurrect/unburn an item, that same button becomes a Burn button!
So, in other words, once you’ve burned an item once, you can un-burn it, and re-burn it, as much as you want!
So, if you only want to get a few reminders on a previously burned item, you can just unburn it. Yes, it will still start back at Apprentice 1. But, honestly, since it’s a familiar item that you mostly already know, working through Apprentice 1 through 4 really takes very little mental effort. In fact, since it will be so easy to answer, it’s like a ‘freebie’, and you might actually find yourself enjoying answering such items, in between the more-challenging items of your current level.
Well, after you get it to Guru 1, Guru 2, and so on, at some point you can say to yourself, “Alright, that’s been enough of a refresher. I don’t need to study this one anymore. I damn well don’t want to have to wait 6+ months just to burn it again!”
And at that point, you simply go back to the item’s page and click the Burn button at the bottom of the page again. Poof! It’s burned! And the button turns back to a Resurrect button once more. (Indeed you could burn/unburn any item you wanted to, over and over, just for the heck of it, as much as you wanted to. Yes, it will always unburn to Apprentice 1. But at least you can always re-burn it if it’s annoying to you!)
In other words, Unburning, although it always goes back to Apprentice 1, is at least a completely reversible action. If you’ve unburned an item, you can just as easily re-burn it!