If you show them a few good ones they will want more, but I wouldn't start to rewrite all the legacy code.
This. Submitter should build a few small projects that give a different end result than the current code base. If you're just swapping R for SAS but delivering the exact same output, no management will care. The sample projects either needs to report the data in different ways, or visualize the data, or even as this parent suggested, simply provide a copy of the output as a spreadsheet.
Innovation will come by thinking about the problem differently and exploring different ways to ask questions to gain insight into your business. If you're just crunching the same numbers, don't bother. For the submitter personally, it's great to learn R and Python, but don't expect an organization shift unless it provides something unique.