My most favorite
Bianca combo ever is
Bianca Marsaili. I think it sounds so beautiful and romantic. :)
I feel like
Bianca is a very multicultural name now. I don't picture any certain nationality when I think of it so it's totally usable. The spelling
Bianca is much more appealing to me, and as you said it retains the awesome Shakespearean association.
Bianca Vivienne is okay, but I'm not a fan of
Vivienne really.
Bianca outshines those other names, in my opinion. I feel like her sisters should have equally spicy names.