I dunno if they're fundamentally different today, but almost every older digital meter has either +- 200 mV (for a display of +-2000) input scale and literally every other "range" is done by input dividers. So if you bridge/remove these, typically one or two, resistors, you can just divide your filtered PWM down.
Tip: The PWM output voltage in itself depends on the supply voltage, and the output after a RC lowpass depends on the loading. Feed the filtered PWM back into an ADC pin and servo the PWM. This way you eliminate both supply and load dependence.