does there exist a device which:
- is bluetooth
- presents as a bluetooth device to a computer
- lets me have multiple connections hot at the same time
- muxes these down into one bluetooth channel

I want something that lets me hear all my audio sources, through one bluetooth headset. Laptop + desktop + tablet + phone.

Instead of only the active one.

As a last resort I am willing to pursue raspberry pi implimentations if you have ideas.

please boost.

edit: no multipoint