I know that there are some people who can use MuseScore to notate the songs just from hearing them, but until someone shares any of the Bways scores (PV, Piano/Conductor, Full Score), it will not be accessible.
I actually went to TKTS and got a seat 7th row center orchestra...$90. Was definitely worth it. While they did cut out some scenes that I think are crucial to the show, it is still a good production, probably more aimed for tourists.