about your 1. there's another more awesome trick:
when renaming variables, you can search for it using / or * (reverse with ? or #) and use cgn (reverse cgN) to modify it, using . to change the next match.
The -gn movement is working on the next match. So you can spare one key (n or N) when bulk renaming variables.
tl;dr : Instead of
you can do:
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