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It wouldn't act to loosen either cup from the headtube, which is the risk in your design.
We'll see. I get your point, but I could also imagine that it will only loosen after many thousands of km, or not at all, that's why I need to run this test.
Also because..
If you were going to all this trouble, could you swap out the head tube?
.."all this trouble" is actually just 20 minutes of lathe work, compared to the massive surgery of swapping the head tube.
jetski
But even if that were to happen in a normal headset the only effects would be that the whole fork would move minutely upwards as the (effectively) conical crown race moves upwards relative to the cup (because the ring of bearings in the lower race would have expanded slightly) and that the top cup-cone interface would loosen minutely. It wouldn't act to loosen either cup from the headtube, which is the risk in your design.