Perfect, thanks! Surprised people are swapping actuators when there's a simple fix like this to keep the factory equipment.
I think I'm still going to build the controller though because it'll be nice to not have to trust a black box system. Your resistor fix though, will let me put sensing on the I/O and try to extract a factory boost map while I'm driving (unless you have one of those in your back pocket too
).
I'm curious to see how the flap and EGR interact. There seems to be a common myth that the flap is used to draw vacuum for EGR... but the block diagrams don't support that. The flap is part of the P2 control loop, and the EGR valve loop is independent. And as you say an error causes a shutdown of the entire system.
As the flap and wastegate are either/or, there's no way to engage the flap while spooling the turbo. So I can't see it being used as a part of the EGR without killing boost pressure entirely - it must be for limiting overboost only.