Like Gerard said, this isn't a solution for a problem that has been real since the birth of AE and something most other compositors that are nod-based have solved.
In Nuke, Flame or Fusion this is a piece of common cake but simple and fast, not like this. Even the discontinued and old Shake had this kind of features years ago.
So finally Adobe realises they ned to act to make an attempt for the most sought after feature missing from AE compared with other compositors and they don't even bother to do it properly. They really want the next generation pushed away to Fusion.
Why didn't they just introduce a proper nod workflow. They have had Flowchart for ages. They could have just added a button to check on the layers to disconnect that particular layer form the layer structure like looking it or hiding it. So when you push that button the layer starts to flow and than you enter Flowchart (nod tree) and connect your connections like a real nod based system but still with the ease and speed of a layer based system.
Please undo this mess and go for a nod workflow or Adobe, you will eventually lose this game.
The RED Bayhem and RED Xenomorph are probably more exclusive than the RED Gemini but with that said, I would prefer the Gemini if I could pick one.