I just learned about git-range-diff which looks very promising to help understand changes done to the history during a rebase. However I'd like to know whether there's a solution to get the results to be shown in an external diffing tool (such as pycharm64 diff for example).
I've looked this up and browsed through git-range-diff's, git-diff's and git-difftool's docs but haven't found one yet. I'll continue looking and will post the answer here if I find it.