So as far as I understand you’re able to open the project as usual.
Have you tried to migrate the specific BP’s into a new blank project?
Maybe you can open them there to solve the issues, on the other hand if it still crashes, you can upload THIS project (way smaller than you actual project I guess) for anyone 
I had a similar problem in earlier versions because of a loop inside a characterBP, couldn’t do much besides waiting for a new version 
Hope you can solve it, it’s a pain.
greetings