Free XLD on your Mac is the way to go. Rip them to AIFF if you want to use with iTunes(which I hate), Audirvana+, Amarra or anything else. It supports tags, art etc. and is lossless. With AIFF you can download same files to your iphone for portable or car listening. FLAC is a nuisance in appleland, as they don't support it. You can convert FLAC to AIFF with many free or cheap software programs.
On mac, it's a worthwhile small investment to buy the Yate app to manage/edit your tags.
Your 2nd step is on the right track. Just skip the 1st step. iTunes sux.
If you rip to AIFF or FLAC you will also be able to eventually copy the files to a true NAS if you decide to upgrade and then still use the mac for accessing the server, ripping to the server on your network etc.
FYI, one of the worst things about building a library in iTunes is that art is embedded on the songs in a way that when you copy the files elsewhere, you lose all the art. Rip to AIFF, save cover.jpg to each album's folder(XLD does this automatically). Then you will have a portable, extractable library including art. Cheers,
Spencer