Interestingly SWIFT was used to effectively depose a Head of State already, specifically Pope Emeritus Benedict XVI. The Vatican's Bank was banned from the system and allowed back on after Benedict's resignation.

The lesson was not lost on Russia or China and they have been building an alternative system called BRICS.

Edit: Here's a contemporary source[1] from a "reputable" newspaper. It doesn't mention SWIFT by name but that's what it was. There were other "reputable" sources covering the story more explicitly back in 2013 as well, but web search's extreme recency bias leaves me unable to find them. Perhaps visit your local university library and they can help you search the periodicals.

[1] https://www.washingtonpost.com/world/europe/pope-struggled-t...