I don't know of other plugins that offer recognition of QR and bar codes. I'd offer it in my Any Vision plugin, but it relies on Google Cloud Vision, and for some reason QR/bar code recognition is available only to mobile devices, not web-based services.
FWIW, and one needs to be comfortable in script/command line programming, I found Zbar code reader that will output the QR code in a file (photo). You could then use that value to rename the files using EXIFTOOL. Here's an example of renaming.
I also found Advanced Renamer which is a GUI tool that could be used but the QR code would have to be manually entered.
I realize that this is outside of LrC but since you were looking for alternate solutions thought this may be useful.