The actuator is easy to get to in an A4, an A3 should be too much harder with your engine rotated 90°.
But why didn't you just change your whole intake manifold for a flapless BKD one? Then the actuator and vac line us redundant and you gave no flaps to go wrong.
I took my EGR off completely though, and the cooler. No issues at all.
Where is your blanking plate, between the EGR and the ASV?
My only blanking plate is where the cooler pipe went into the turbo housing.
What experience do you have of H&R and Eibach Sportlines?
I did a lot of research before fitting Sportlines to my **** dragging Avant. And if you already have S(hite) line suspension then Eibach Pros don't lower it at all. It won't be subtle, it'll be non-existant.
Bilstein B8s are designed to...
I second that about the pinchbolt, there's a good YouTube video ( don't seem to be able to link them here anymore) showing how.
Most other bolts should come undone ok unless totally rusted, and the rear springs are a real pain.