It isn't getting around an eye witness account, it is understanding that the eye witness used an idiom... an ABSTRACT manner of speech. When he said, "three days AND three nights" then he meant "any part of three days and nights." I shared two verses from 1 Samuel where in one place it was "three days and nights" and then that same time, in the next verse, was referred to idiomatically as "three days."
You are clinging to a verse that says three days... and ignoring Yeshua when he said, "three days and nights." Either that is in conflict of at least one of those is an idiom. Since "three days AND NIGHTS" can't mean "just three days" then I lean toward accepting "and nights" as meaning Friday doesn't work.

But you are welcome to take it as you see it. Again... we are not at odds with the core message here... just with how we count to get there.