I have a guitar without electrics and do use an across the soundhole pick up which sounds OKish (it's a Fishman thing). But it does have that "I'm not quite an acoustic sound" which probably bothers me more than it bothers people listening!

So I bought one of these which sound ok but have never tried it at high volume. There are examples online of ity being played in live set ups

irig

A couple of demonstrations of the sound and there are plenty of examples out there. Potentially stops you being stuck with keeping close to mic the whole time!

This one played with a keyboard and voice suggests it can play at a reasonable level - Live with keyboard

Sound example and Sound example and Sound example

I have no connection with them. Could probably try it in a shop. It can amplify an accordion - now there's a weird thought!