How do I swap the two last command line arguments?

$ ln -s ./dir/target.txt /path/to/source.txt{cursor here}

How do swap file typed filenames in command line? Alt+T swaps words, not filenames, resulting in ln -s ./dir/target.txt /path/to/txt.source.

Ideally the solution should also interpret "filenames with quotes.txt" correctly.

Can it be done by some readline and/or bash configuration, or by some clever use of existing shortcuts?