This SWIFT ban only really affects the usual IBAN to IBAN transfer of the plebs and SMB's. Large payment processing and gross settlement transfers will just change to accomodating intermediary banks in China within a couple days, and that'll be that. Further fund movement will be done through the Russian-Chinese CIPS.
Never forget EU commissars are not elected officials, they are named by an totally informal group called "Eurogroup", to which supposedly only 15 EU presidents participate. However, as it's not formal, it's completely opaque how they get chosen.