Phone/Tablet on Lectern
If you have a single microphone on a stage or lectern, just place a phone or tablet on that lectern and run Breeze Translate from it. It will pick up the voice well enough for a good, clean transcription.
Tie-Clip Mic
A touring preacher can use a tie-clip mic attached to their phone. Keep the phone in your pocket, run Breeze Translate from there, and you're all set without needing an external system.
Bluetooth Headset
Some people use a Bluetooth headset to run the translation just for the sermon, which is another easy way to trial the system.