I believe it should work for you. I got this to make a connection of my BOSE QC 35 to my PC which doesn’t support bluetooth connection, and I prefer to use optical output. While I was pairing my headphones my Samsung fridge got also connected to it in speaker mode. So surely this device supports 2 bluetooth devices together. Just make sure the optical output is set to PCM not Dolby because the 1Mii doesn’t support audio compression.
I think this little device should do the job you need.