2021-01-20
So I accidentally discovered that you can assemble prefabs in Unity's Play Mode and copy them from the scene and then paste them back in when you return to Edit Mode.
Previously, I've done Copy Component to preserve information that was tweaked in Play Mode.
But copying a whole Game Object (or Objects) seems to be simpler, faster and yields similar results.
Working this way has definitely sped up my ability to construct levels. Any limitations are bound to be discovered!