Heya,
I would go with a 2nd body. You don't need the best glass for a wedding. You need bullet proof reliability at a wedding as there's no do-over. A slightly soft photo due to miss-focus, or soft glass, etc, is actually quite fine if the composition is good. A super sharp photo is pointless if it's just a snapshot or bad photo to begin with. So I would not stress new glass. I would however want two cameras. Less down time, swapping lenses for each stage of the ceremony.
I'd put the 50 F1.8 on one camera.
And put the 240-105 on the other camera. Or, the 11-16 if it's an intimate/small venue. Just be very mindful not to put people in the corners when shooting ultrawide or even wide, as in, don't get hands/feet in the corners, and you'll avoid some obvious distortion.
I'd leave the 70-200 out, if shooting APS-C, it will be really long and you'll spend more time at the short end, unless you just want face-shots or want to stand back over 40 feet.
A 2nd camera will let you seamlessly move between without stopping to change lenses for whatever. You don't want to ask a ceremony to hold while you change lenses. This is also when the bad stuff happens--the drop, the fumble, etc.
If you were to get another piece of glass, I would actually argue for a 17-50 flavor to have a standard zoom and still use the 50 F1.8 for the formal/lowlight/creative stuff.
Very best,