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That could probably work.
Were it me, I’d build a script that would re-hash and compare all the data to the previous hash as the first step of adding more files, and if the data comes out consistent, I’d copy the files over, hash everything again, save the hash results elsewhere and then repeat as needed.
Since it appears this happened 8 years ago, and uh, I can’t say that I’ve seen a single MP3 file since then, perhaps nobody still cares.
If you’re building a music library, and you’re NOT using some sort of lossless format, I’d love to know why. I know a lot of people with massive libraries, medium libraries, and just shit they like one song at a time and not a one of them isn’t using FLAC files for it.
They might transcode into something occasionally, but it’s always something like AAC or OPUS, not MP3.