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This is how the bearings and top split shim look like
Interesting design. Normal compression rings have a flat top, not a chamfer. If you can fit a normal compression ring (probably 45°), then I probably have something that will fit, there are 12 different stock sizes so it's unlikely to need anything special order once you've got past the funny compression ring issue. There is an official Dogma slammed headset cover that's only 3mm, but the only place I can find them without trying is Glory Cycles (nice people, but a long way away) for $49.99+shipping, that probably means your local Pinarello dealer will want £50 the way these things go.
@mdcc_tester
Have you ever done a low stack cap for a Dogma F8/F10?
Steerer is 1"1/8 but I don't have the bearing external diameter at hand.
This is how a standard 15mm round cap looks like:
This is how the bearings and top split shim look like:
And this is how the top of the head tube looks like:
If I'm still in time I would like to order one from you!