HonkyTonkJohn, there is a setup that I have used for musicians with good success. Ask for a Unitron brand behind the ear hearing aid with musician microphones. The only option for getting these hearing aid microphones is on their behind the ear hearing aids.
I’m not an engineer that can answer AtoD conversions or that level of technical queries, however I know sound. You want a microphone that will not distort during a show. This is the only type of instrument that I know of that can do it. This has been backed up and developed with Unitron by a man named Marshall Chasin. If you google his name, you will understand what he does.
Good luck,