Suggestions from the perspective of "save your a$$"
I once recorded an opera vocal with a royer ribbon mic and it came out great. It could totally take the level and did not sound piercing. Would I win a grammy for it? no. Was it a disaster? nope... actually quite excellent. I love the endearing sound of a vocal recorded on a ribbon mic. Maybe this would be tolerable for your project.
Otherwise be ready to ride the level. A distressor would be great. If you have one of those little microhone guards
Auralex MudGuard | Sweetwater.com it will come in handy because otherwise, you'll hear more room sound in your vocal mic than you ever have before.. You don't want it. You want concert hall.. You should probably have a nice verb during tracking too..
I wouldn't be embarrassed to ask to re-cut / punch the louder sections (if you have to), packaged with a compliment that "Your voice is so dynamic and powerful" unless they complain. Try to ride it first. If there is no music track and it is solo voice only, then you are out of luck there.
I have never tried two mics and maybe that is the way to go but watch the room sound..
Disclaimer: This is my best attempt to be helpful based on my experience. I am not an expert at recording opera in a vocal booth although I have recorded opera in halls, and other extremely loud vocalists in a booth. The ribbon worked there and my booth was already super tight in room sound. It worked. I'd be really curious to hear how this works out for you.