Lets just say if you would ever sell WISA boards with optical out i would buy a few.I've been working on a soon-to-be open source wireless audio solution for some time, now.
Lithe are also directly selling the Summit WISA boards, so that might be an option for some people. They are relatively expensive.
While an open source solution is obviously a great idea. It's going to be very difficult to replace something like the extremely affordable WiSA SoundSend as it offers eARC and Atmos and DTS decoding.