At today on Kdenlive there is a part of a workflow already that looks like on the right way.
To complete it still misses 2 main features: buttons for selecting which video is on the program window and an automatic way to overwrite with a blank space the tracks which are not selected while you're playing for editing.
My suggestions are:
1. Create a new window on purpose for this task.
2. Use the program window for monitoring the result.
3. Decide a way for controlling the edit (I guess that buttons on the multitcam window which you can control by number keys on the keyboard, it can be a practical approach)
https://kdenlive.org/node/9458#multi