I had an AirPort Express as an audio bridge to my stereo for years, maybe a decade? Thing was bullet-proof and the only reason I finally put it down was all the new stereos have built-in casting of some sort.

https://www.ebay.com/itm/203874699472 was great, had everything you could want in a compact size, and was compatible with the power adapter cables (which are still the same these days)!