You need a low noise, low distortion gain stage that behaves well when overloaded, a compressor or limiter stage, then a line driver.
Doing all of that with one transistor is a great idea but perhaps use a couple more, or op-amps or a dedicated specialty IC.
Tried the
SSM2166 and found it terrible. High noise and distortion, and the IC shares some internal biasing so the mic preamp made other sections of the IC misbehave. Tossed that design in the garbage, and instead went with premium
THAT4320 which has a compressor and limiter with low noise and distortion. Top performance but complex and expensive.
If you used a two-transistor gain stage, and then a push-pull output stage, that would be best to get a few volts of signal.
Car/SUV NAV headliner microphones Toyota uses a dual op-amp design. One for gain/filtering and another for voltage follower, but no limiter.
How long is the output cable run?
Beyond about 3m/10ft I would suggest using a balanced output.
I've had installers screw up and put in the wrong kind of cable. Either no shield at all, or one overall shield, instead of a dedicated shield for the microphone signal. The cable can also get pulled alongside mains cables, or alongside the speaker cable, adding to the headache.