You're better off buying a cheap USB optical drive, re-ripping those CDs, and transcoding the files to something like Opus, which offers comparable quality to 320kbps MP3 files at lower bitrates (which also means smaller file sizes).

Or you can just "download" the FLAC versions, transcode those, and delete them after.

Also, kind of funny how this was posted just after someone complained about the same thing in the audio engineering subreddit.