Regarding the Silicon Labs WT32i, I found this interesting thing:

https://www.youtube.com/watch?v=oVwzLz0dO1w

This looks real interesting to me. Look at all that audio I/O on that dev board. Haven't looked up pricing on it yet, but wow.

Edit:
http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=49919
https://www.ebay.com/i/263156265565?chn=ps&dispItem=1
https://www.silabs.com/products/wireless...th-audio-module