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36 is the diameter of 1 1/8th 853, so its not a totally stupid idea, but as you've stated that it sucks in below the cups I still think you'll run into distortion issues.
It won't be a drill you would need, they're designed to drill down into material, you're just attempting to remove material on the id, so its a fuck off end mill or a swathing cut on a circumference cutter. You then have to ask how you're going to hold the frame whilst cutting, plus centring. None of these are insurmountable, but time consuming. As its a complete frame already, you will need a big mill to do the job, I have 3 mills and only the Bridgeport would be able to fit it I'd imagine. So...... When you add up the costs involved in set up and machine time, a new head tube from winston (most experienced frame builder in london) at 90 squids sounds like a much more cost effective way of going about it.
I'm in no way against cutting things up and trying to put them back together, I think its a great mindset to have, to ask "what if I......" I just get the feeling that you're not doing this for fun, but actually just want an 1 1/8" fork, and the best way is to go to Winston.
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PhilDAS
Thanks for the responses folks! The outer diameter is 36.5mm (measures with a caliper) so I reckon it is doable. I think perhaps a drill would be best but as you most of you say securing the frame would be expensive. I guess I may just have to bite the butting and find some 1 inch forks, until I can find a way of doing this effectively.