Generally IBKR doesn’t like it so much if you abuse them for currency conversion. I remember hearing about account terminations after warning. But I have used them before and got no warning.
There is a direct integration with Wise. The money transfers within hours.
Wise also has quasi bank accounts in multiple currencies, with which you can send and receive money in your name. Some businesses still don’t work with Wise, and block (e.g. Degiro) or are blocked by (Wise → Kraken, but Kraken → Wise works).