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@MCamb
I think you may find that in practice it's a lot of material to remove, possibly more than what a reamer is capable of?
Could maybe be up to the job, but more likely would be a suitable sized drill bit, using a reamer to clean up the area afterwards. The frame would have to be secured in place with a jig, All increasing the cost...
I experienced something similar trying to remove some butting in a very short fork steerer, as I couldn't get a quill stem in past the minimum insertion. The guy I took it to said it was a fairly big job, and he was only removing a minute amount of material.