Drives don't need much power, so using splitter cables would be option for getting more SATA power connectors.
https://www.overclockers.co.uk/akasa-sata-power-splitter-ak-cbpw05-30-cb-058-ak.html
Email corsair. They can supply any cable you need. They had a delay last year due to mining but I'm guessing that shouldn't be an issue now.