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Squeezelite with a USB spdif out might work? (I’m unsure myself, I have my squeeze server able to connect to my casting devices)
Bonus: a USB spdif out isn’t pricey says a very quick search
Edit: I’m dumb. https://github.com/sle118/squeezelite-esp32?tab=readme-ov-file#spdif
So they suggest either a specialized chip, which will likely need more hardware, or this little circuit. (See link) I would say if you had an extra coax cable, to cut an end and solder away, but that’s assuming a lot.
Second edit: they can connect to Bluetooth as well.
I assume there is a land line in the house, some people still have those.