How do Maine and Nebraska get away with splitting their electoral votes, then? Just asking.
Both deal in proportions.
No they don't. They apportion by congressional district.
Applied to Nevada in 2016 instead of the State’s 6 electoral votes going to Hillary she would have received 2.88 and Trump 2.12( or thereabouts)
Nothing in the Constitution mandates how a state's electors vote. There is no requirement electoral votes be based on a popular election. That is why there are always faithless electors who vote for people who did not win the state's election. Indeed, sometimes even if they don't run. Faith Spotted Eagle got an electoral vote in 2016. So did Susan Collins.
Mind you, I think it is a bad idea to do it on a state by state basis. But your reason for arguing it's constitutionality is off.