If you add a source resistor, say 2.2k, many mics can work just fine on M10 or D50 plug in power.
I've run many capsules, including Countryman B3, AT853, Sennheiser KE4, WM61A, etc. I did notice some distortion on the Sennheisers, but that was for a very loud show. In most cases these work just fine.
Richard