I have this book for piano and vocal:
https://smile.amazon.com/Miserables-Alain-Boublil/dp/0793529182/ref=sr_1_2?crid=261DJ97DQW10W&dchild=1&keywords=les+miserables+piano+book&qid=1628003739&sprefix=les+miserables+piano%2Caps%2C174&sr=8-2
I just took a look at the vocal part and it looks like it's all within range with the exception of one low G flat. But most of it is in e flat major, unfortunately...