I had a very similar situation last year, left everything else at home and just took the Sony RX1. The couple put me nearest to the top table to make life easier.
The best bits about the RX1...
a) Completely silent
b) Small enough that everyone thinks it's a regular P&S, therefore takes no notice of it
c) Full frame, so lovely shallow DoF when needed, great high ISO and lots of cropping ability
d) I could enjoy the wedding, in fact the camera is so small it went in my wife's handbag when not in use
The couple generally had no idea when I was taking photos or of what, so they had a nice surprise when I sent them a disc full a week later with genuinely 'discreet' coverage of nearly the whole day.
I would never take a DSLR to a wedding unless specifically asked for all of the reasons others have mentioned, Fuji X or other small mirrorless maybe, but nothing else. I shoot with less kit than you've mentioned when shooting a wedding professionally! 35 and 85 across two bodies will see me through a whole day, a small handful are taken with a 70-200 but they could easily be covered by the 85 if needs be.