It looks like a SFX power supply, I wonder if the power cord could be replaced with something like this: https://i.ebayimg.com/images/g/YfYAAOSwy4tiZtJF/s-l1600.jpg

That would enable the use of something like this: https://www.amazon.com/Cooler-Master-Efficiency-Included-Warranty/dp/B08LP6WS35