Quest 3 has speakers built into the VR Headset, as well as a mic. I don't use the Headset mic, as I switch between VR and monitor based what I am doing at the time. Fighter plane flying is with VR, Tanking is on the standard Monitor, as is bombing. Using the monitor involves using the standard desktop speakers, as well as the lapel mic.
Well then, your only way out of that is a headset for sound when not on VR instead of speakers.
Basically you’re using a lav as a table mic.
Most real table mics are cardioid they don’t pick up as much from the rear of it, mostly front.
A lot of the consumer lavs are omni-directional, they pick up all around them, including the rear of it. I think I can ASSUME your lav is omni-directional.
No matter, Omni or cardioid, because of proximity/distance Lavs need to run hotter, which pulls all that bkg noise in. Just less with cardioid.
Omni-direction are used by TV studios, because there are no speakers in the room and they can turn their heads without losing volume.
A live stage we use cardioid because speakers on stage so they can hear themselves talk. They turn their head we run volume up to keep it consistent, down when their head returns to center.
No matter how you cook it, lavs are by far the hardest to control. I’ve seen guys fired because they lost control on a live stage.
Consider your setup a live stage. You will have issues.
To consumers they are a novelty, to an engineer we have to use them and hate it the most. I wish they wouldn’t sell them to consumers. A trained engineer can struggle with them. I totally advise against them to consumers. Omni and speakers the latency can create an echo.
I know people spend money and become attached to their setup. However, If I were to advise, in your situation, I would suggest just changing headsets. It is MUCH cleaner. Koss makes a $30 headset, which I now use, that works very well. Effortless clarity.
On top of it all, the consumer quality is much lower than pro. Ours cost $2k with a wireless belt pack, the wireless receiver is another $1k+.
Some may find a working honey spot and promote them, thats a rarity, not a norm. I advise against them, the novelty brings struggle. The typical consumer is not aware. They just want your money for novelty.
So my advise is $30 will solve all your problems. You will be much happier. Even if you turn the headset mic off and use your table lav, the sound is isolated to your ear, not open air, no bleed.