Building a screen with screen capture-only viewport

Hello,
I’m building the main menu of our game. There is a character customization screen so there are objects in the scene but I’m capturing them via a screen capture 2D component instead of a regular camera because I want to capture the character from the front and place that view onto the left side of the screen. I will cover the rest of the screen with UI so I thought I should disable the camera to conserve performance but I can’t seem to be able to. Is there a way to do this without a render texture or can I disable the camera?