Thanks! I thought there would be a way something like this. To be honest the tool as posted is just a hack to demonstrate the point that it is possible. I ha

Thanks! I thought there would be a way something like this. To be honest the tool as posted is just a hack to demonstrate the point that it is possible. I have an idea for a somewhat more refined tool which would let you mark small stretches of data (not whole partitions) for modification, and provide additional tooling to do the mods and update the checksums. As well as implementing the whole thing again for xz & zstd, which is another large chunk of work.