That sounds like the story of every project I ever start!
I think it ought to be possible to create a copy of BlynkSimpleShieldEsp8266.h and save it with another name, then include the new filename in your sketch. I’ve not tried it though.
The advantage of that would be that any updates wouldn’t overwrite your modified file, and if you try to compile the code on a different machine then t would tell you that the modified library was missing.
Anyway, glad its working, even though you don’t need it 
Pete.