HI
I occasionally do weddings and have this attitude.
If you speak, you wear a mic.
typical setup
1) rifle mic on floor pointing at B&G for ceremony (NEVER RELY ON A RADIO 100%)
2) radio mic on Groom
3) radio mic on vicar/official
3) radio mic on lectern for readings
4) zoom recorder nearby as a failsafe or to record choir in stereo
Speeches
Everyone who makes a speech wears a radio mic AND the toast master as they speak too.
Evening
Radio link the bands PA desk back to all cameras with a mix between the PA sound on camera mic and direct feed in post.
The only answer if you want to do the audio properly is to spend the money.
Peter
Post Production Dubbing Mixer