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ffm
jetski
My idea is that the softer aluminium will be headset-pressed onto the paint- and residue-free but not-so-perfectly cylindrical steel heattube simply by brute force as soon as ID and OD roughly match. According to Park Tool, the difference of ID and OD can be up to 0.3mm for a press-fit to work.
Will report how it goes. If it's shit and goes loose all the time, I will machine another set from steel and simply braze it on.
By the way, what I really don't get: as there is no doubt that the brazed-on version would work nicely, why isn't this already available as a product in framebuilder catalogues.