I have purchase like 15 of the gray and black dimmer plates for the red series and just swapped the airgap and it works 100% without issue on the blue 2in1 series. and i can pull the airgap easily.
Here are 2 pics showing the blue series switchs using the red series plates and the blue series air gap.
3d printer needs repairs so i have not 3d printed mine yet. But might just use paint to change it from white to gray/black