Thanks all for your input, I called sales and spoke to a guy in the Tel Aviv call center, he said there is no one who can calculate, but it would be quite a bit to change the fare class and on top of that I'd have to pay 700 Matmid points. L class can possibly be upgraded at check-in, at the rate of $700 cash.
Does LY have anything like an SWU?
Lie-flat or not (I'm keeping out of your debate), 170 degrees will be much better than coach