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@Rik_Van_Looy
While I wait for the headset to arrive I shall prep the headtube.
The plan is to counterbore top and bottom of headtube. I managed to blag a sheet metalworkers holesaw with a range of bores and will fettle the cup to suit the most appropriate hole size that the saw can cut as shown in the diagram below.
Once I've achieved a neat and tidy interference fit I can pass it on to someone with an ARC or MIG welder in the hope it can be held firmly (without thermal distortion).
The hole saw has the following sizes: 26.9875mm, 30.1625mm, 33.3375mm, 36.5125mm, 39.6875mm
Since I'm looking for 29.85-34.4 the preferred option is 30.1625 (1 3/16") - I'm a bit scared of 33.3375 in case I don't keep a steady hand and break out of the tube!