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Can you think to achieve the same final goal with a different shading device (switchable glazing)?

Let me explain :

if you use a switchable glazing rather window blind as window shading active system you can use the built-in control type MeetDaylightIlluminanceSetpoint (please see WindowShadingControl object). Then use the same illuimnance level (lux) to control your artificial lights through Daylighting:Controls object.

In this way you do not have to build a EMS program and you will probably achieve the same goal (setting dark glazing properties as you glazing+blind)