One way to do it is create orphan rem as you go and then sort through the stub tag (pin it to the sidebar for easier access if you decide to go that route), yes. I was advising creating a few rem that will be used as unsorted inboxes that are also pinned. This saves the hassle of potentially having multiple stubs to merge and allows for several places to store different unsorted things (fleeting notes for your own thoughts and literature notes with references, for example), but adds the hustle of switching to the inbox to type.
It all depends on whether you wish lean more on tags (whose only meaning is sorting and filtering, so they can be words rather than sentences) or zettels/smart notes (you want to place every note just so, be it behind/below other notes or in an index/entry point).