Multiple Bluetooth Audio Source To A Single Bluetooth Headphone At The Same Time. Is It Possible?

[gfmucci]

First of all, I dunno which category to put this thread in as it's more about Bluetooth headphones but also involves Bluetooth-capable smartphones & tablets as well which is why it's placed in the "Phones & Tablets" category. So if moderators feels the need to move this thread elsewhere to it's proper category, feel free to do so.

Now I'm looking for a Bluetooth headphone that is capable of syncing with multiple Bluetooth audio source at the same time such as Bluetooth-capable smartphones, tablets, stereo system, PC, etc. The reason for this is that I wanna listen to multiple audio at the same time, for example, listening to Eminem & Skrillex while also tuning to podcast & YouTube, all simultaneously. As it is now, I can't seem to get my current Bluetooth 4.0/4.2 headphones to sync to multiple Bluetooth devices at the same time. Another reason to get a Bluetooth headphone & not use the speaker is to listen during nighttime & work. I don't listen to audio at any level more quieter than max volume.
So I'll spit out my multiple questions into numbering points instead to make it easier to answer.

1) Is there such headphones out there?
2) Is my current Bluetooth 4.0/4.2 headphones capable of doing this? If yes, how do I get it to sync?
3) What was my third question again? I forgot! Ah, yes...
4) If this is all not possible, is it the Bluetooth limitation?
5) What else... I guess this is pretty much my questions for now?

Given that current tech does not facilitate this, I would do Plan B as follows:

Research which make/model BT buds allow a left or right to play individually in one ear.

Acquire two sets of these after confirmung that two different sets can work concurrently via 2 different BT frequencies.

Put the left bud from one set into your left ear and the right bud from the other set into your right ear.

Connect bud set one to one source and bud set two to your second source.

It won't be stereo, but you will get your two sources concurrently via BT.

I would do this if I wanted to hear background music at a low level while listening to voice audio.