@gratgrat27 Not sure how to do this in Windows, but on macOS using the BBEdit text editor, I can 'Go' to a specific byte (not bit, I think) in a file, which then shows the line number. I expect there's a way to do this in other text editors?
Searching for "convert byte index of file to line number" comes up with a few Python/Command prompt ways of doing it, but haven't tested these. Maybe it would be useful if RRF put the line number (even in comments) in resurrect.g, @dc42 ?
If you can get the line number, then you can use M110 to set a new line number a few moves before.
Ian