FML, wrote or copy pasted too much again, here's an actual long ass post but in a single link when it comes to Bluetooth codecs, it's not that comprehensive though but provides decent enough info.

If you want Bluetooth or TWS earbuds for PC, here's also more direct info: https://www.reddit.com/r/HeadphoneAdvice/comments/z74tif/wireless_earphones_for_pc_microsoft_teams/iy59w0n/

So the TL;DR for that is make sure you disable the "Hands-free Telephony" in the Bluetooth devices or Sounds settings.

And then for microphone options, there's some new options for IEMs now.

Like there's products like the Kinera Gramr and so on.

Btw for the Gramr, some people say the sound quality is good, some people say it's not. There's a decent video from two weeks or so ago on the Kinera Gramr by Teknickel here: https://www.youtube.com/watch?v=SUzVpJkH4YI

Here's some more info for gaming with IEMs, more about microphones and so on: https://www.reddit.com/r/HeadphoneAdvice/comments/10hbqxz/budget_competitive_gaming_headphone_recommendation/j58hbcx/

For headphones there's the usual Antlion ModMic and so on stuff that you can attach on the side of the earcups.