See if this gets you to where you’re trying to go:
Select a couple of clips in the project bin, right click and select Create Multi Camera Sequence (name it, choose sync method, sequence preset, etc.)
Right click on the MCS that is now in your project bin and select Open In Timeline
Now when that sequence is open in the timeline you can add just audio, consolidate clips in a single angle, duplicate audio tracks to replace audio for specific video tracks (angles) and on and on
And best of all, in this mode you have a Channel Output Assign icon with each audio track so that you can choose which channel of any audio angle goes to with the corresponding video.
So then when you have that all set up, right click on the MCS in the project bin again and select Create New Sequence and a new Multicam Sequence will be created ready to edit with.
The video or audio for each edit (angle) is selectable just by toggling with the number keys.