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@Rik_Van_Looy
Analysis of "inverse shim" options:
*1) Flypress/turned steerer: *
Tempting, but I'd imagine total cost could be prohibitive - I'm aiming £10ish + beer for welder.... Were the frame more exotic/valuble and not to be chopped this would be the way to go.
*2) Period correct forks: *
I'm loathed to pay retrotwat-tax on inferior forks that I won't like riding and can't transfer to Transalp dream-machine....
3) Weld reinforcement & ream:
1.125" forks in 1" headtube - not uncommon in BMX (but BMX headtubes are much meatier and bigger)
I've seen this in a blog but it raised 2 issues.
a) I'm not planning to braze so the idea of brass wicking up the perfectly toleranced/clinically clean gap between reinforcement & headtube is a bit fanciful.... - this is going to be a proper ghetto job - Arc welding (or MIG if I'm lucky).
b) Reaming headtube to fit cups - I've had a scratch around in the drawers at work and none of the adjustable reamers are anywhere near big enough so it looks like the reaming would need to be left to a frame-builder...
The only framebuilders I can think of who'd ream headtubes for beer are Cycles Maximus and I don't live in Bath anymore, and I bet they're all posh and executive by now.
4) Weld cups of a steel 1.125" aheadset to headtube: Do they even make steel aheadsets? If so this probably looks like the way forward... If I could chamfer inside of the headtube and mod the cups to fit (The only risk is heat distorting headset cups).