Saves are tied to a persons account, so you can't play other peoples saves. So basically no. There is no way to 'skip' to Infamous difficulty.
But technically there IS a way to play Infamous without the gear/perks. And that is to play through one of the regular difficulties (easy-hard) without upgrading your character. Which would then unlock what you are asking for.
I know that's not really what you wanted, just saying it's possible. I might actually try it myself just for fun.![]()