Don't think that a 14-day pass will pay off. Here is a JR Pass calculator.
https://www.japan-guide.com/railpass/
Another idea. Juggle your schedule so last night is in Osaka. Catch a morning flight on JAL from Osaka Itami airport (domestic flights only) to transfer to departure flight from NRT. One less move. Here is discount domestic flight info for tourists only.
https://www.world.jal.co.jp/world/en...lorer_pass/lp/