Will report back when I get it working 🫡
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I found 
which should simplify the DIY side of things to avoid soldering stuff
Apollo Automation
CAST-1 Audio Casting
The Apollo CAST-1 makes your non-smart speakers smart! The CAST-1 plugs into powered speakers, amplifiers, and AV receivers with a 3.5mm cable and ...
Ooooh nice. I like that. Currently I have to tap some bluetooth stuff to get our main speaker set to play my audio.