wy fy?
for extra cheap solution just add an Amazon DOT and combo cable. cost is $50 plus interface cabling.
voice is the remote.
it supports many streaming services and then just stream away with your bad self!
for a secondary one box solution, in over coming interfaces and distances it seems to me you should look into getting a new Blue ray player that supports DLNA.
the caveat here is to ensure which file types are suported by the BR player first.
it can then be the spinner for your discs and allow playback of your pc oriented files via a third party server app.
maybe a used OPPO 103 or 93? email OPPO to make sure or check their website.
FILE BROWSER ($7 approximately) app works on tablets and phones and will show you the network resources, NAS, PCs, etc. it will allow playback to and from different devices including the BR player I think. although there are other server apps out there besides FB. some are free.
otherwise, and as you probably know, proximity is key when computers are mixed into the audio system.
getting wired?
USB suports a limited distance, optical a bit more. Sorry I can not further quantify these numbers better.
as such, other means could be an Apple mini, or some other used laptop or pc and relying upon its mini stereo output jack and a combo cord which splits up into RCAsl;..
both PCI and USB cards can be had pretty reasonably. depending on how much quality you wish to acquire. like anywhere else, mo' better means mo' money.
I've used numerous brands of each type.
AQ Dragonfly USB black or red $100 to $200 respectively, if a PC is gonna be sacrificed could . be an option.
then add in or on, apps which also have Mobile device support to control the sister app on the PC/Mac then residing at or near the preamp so your phone or tablet acts as the remote.
nab a subscription or six from the net and have fun.
IMO? I'd figure on getting a network (ethernet to USB or SPDIF) bridge and the dAC you can afford and arrive a tad more seamlessly to the result while obtaining better sound quality in the doing and not forcing another personal confuser to be added into the mix.
good luck.