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A previous post in the series tests a Parchive utility called MacPAR deLuxe:

Looks like a very useful utility, and it keeps the ECC in a .par2 sidecar file exactly as I wanted. Unfortunately it's Mac only.

Thank you very much for that link. Do the variants all use the same file format?

It looks like the sidecar file doesn't contain the ECC information, only checksums that allow you to know if the file is corrupted or not.

ECC plays the role of a checksum too.