Total newbie asking some basic questions. Let's say I have 3 devices that I want to connect to and simultaneously transmit audio to a single bluetooth headset...

Could I use a 3.5mm audio mixer with those three devices as inputs and a 3.5mm to bluetooth adapter to then send the sound to my bluetooth headset?

Now, let's say I'd like to also switch between the 3 devices with my bluetooth headset to use both headphones/mic. Would I be able to use a 3.5mm splitter, split the sound from the devices to both the audio mixer and an audio switch with the output of the audio mixer plugged into the 4th slot of the audio switch and the 3.5mm to bluetooth adapter plugged into the output of the audio switch and either choose the mixer as input or each of the 3 devices individually?

If that works, I think I heard that splitters make volume lower than normal from output devices? Would I then put an amplifier between the 3.5mm bluetooth adapter and the audio switch?

This is all seeming like it would work in my head but I have literally never worked with any audio equipment before so, figured I'd ask.

Also, is this totally overkill and is there a way easier way to solve my issues?