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Few days old but...
I think this exactly what you aren't after but I have this:
http://www.wiggle.co.uk/profile-quill-to-threadless-stem-converter/
Which does indeed use an M6 bolt and top cap.
tallsam
Looking for a quill - ahead converter that uses a standard 1 1/8" ahead stem cap.
A lot of the ones that use a cap (rather than a plastic bung with the bolt head hidden inside) look like they use an m6 type size bolt rather than the m5 or m8 instead of m6? You see what I mean anyway.
Edit, I think the BBB bhp-20 fulfils my criteria, anyone care/able to confirm?