I would do this. Get a Bluesound Node 2. You can access all your music files with it at home without using your PC. Also, you will enter the world of streaming via Spotify, Pandora or whatever streaming service YOU like. If you pick a streaming service like Tidal, you can still enjoy digital streaming files wherever you are via a tablet or your smartphone and you can start to explore MQA, which is a really an expanding library. The library you build can match what you have in flac at home AND you can play your flac files at home. Now you have something to enjoy your current digital music library and really explore and grow your music library. That will cost you $500 and the cost of a monthly subscription. It’s a budget solution that, for music luvers, can be very rewarding.
If you are determined to play your files on the fly, I have done so with a Western Digital MyCloud NAS. With all my digital files loaded on the MyCloud, I can access them via my smartphone wherever I can get a phone signal , network or wireless connection. I am limited by the processor of my phone and my connections so I will not get hi-rez sound. Just one idea.....