Ha. Surely the poster has an internet connection and either a smart phone or a computer. I took my smart phone an older IPhone, with a 3.5 mm out and two rca's on 6'' cable I found. Plugged into a preamp or aux on his receiver, play a tune from YouTube and see if you like streaming, no need to spend any money or let alone learn what a roon endpoint is at this point. Your making things hard for this fellow!
It's not gonna be the best sound in the world but he'd have an idea how it's done, he already has a dac in the phone or pc.