CM Doesn’t support enabling subcomponents this way.
The correct way would be to have 2 vcams: one with POV and one without. Activate the one that’s needed.
Then why not just add a few conditional compile to support older builds. That’s what so many single devs making assets on the store sweat to do so I’m sure your team can manage.
There are limits to how much we’re willing to complexify the code. Sometimes it’s better to make a clean break. There is already a lot of conditional compilation in CM, supporting Unity all the way back to 5.x. No one is forcing you to move to CM3; you are welcome to stay on 2.X if you’re not comfortable upgrading Unity.