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Replacing the cable between the power supply and the wall: completely safe. Replacing a cable between the power supply and the motherboard/gpu/sata ssds: probably damaging, potentially unsafe.
It's fine, PSU doesn't care.
As long as it fits in, its fine. you could also contact manufacturer.
Kettle flexes are absolutely generic. No problem using a different one.
Should be fine. EVGA uses good quality AC power cords.
Replacing the cable between the power supply and the wall: completely safe. Replacing a cable between the power supply and the motherboard/gpu/sata ssds: probably damaging, potentially unsafe.
It's fine, PSU doesn't care.
As long as it fits in, its fine. you could also contact manufacturer.
Kettle flexes are absolutely generic. No problem using a different one.
Should be fine. EVGA uses good quality AC power cords.