Hi,
I think if you connect the bridge rectifier direction to the 220vac output then the diodes forward drops have less influence on the voltage measurement.
That would put the 220k resistor on the DC side of the bridge rect.
Also consider that with 1ma input you only get about 0.7ma output, so the resistor values on the output probably have to be increased.
Also, LED efficiency drops with age, meaning less light output over time, and it is somewhat exponentially related to the drive current. So the lower the current the better the aging is so the more stable the output voltage will be over long time periods like years. I would think 1ma should be ok though, but it depends on the max current of the LED. One tenth the max current should be ok.