Hmm not ideal but it would probably be ok. Adapters are an additional source of resistance which are best avoided but seeing as you don’t have a choice it’s probably ok.
Im rethinking, putting the cable problem aside I wish it was a better quality psu to start with. It’s not one I would recommend.
I really, really, really hate using adapters. Always the weak point.
It wasn't really a bad PSU when it came out. Group-regulated, but it was competently put together by FSP, even if nothing amazing.
But it's a really old PSU at this point. I'd use this as an opportunity to upgrade to something with a modern design that wasn't manufactured back when Bush was still the president.