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Not me. I have made my own brake bells:
but I've never fitted a new disc over a handbrake part of a disc. The only difficulty, I'd imagine, would be ensuring that the centre spigot on the hub is deep enough to locate both the chopped down original disc and the new disc on top. And obviously the new disc would have to have a centre section big enough to accommodation the chopped down old disc centre. But provided both of those can be resolved, it seems to me it'd basically be the same as running a wheel spacer.
If the centre hub spigot isn't deep enough to locate the old and new discs together you might need some extra machining to have a new deeper spigot fitted somehow, rather like with concentric wheel spacers.
Brommers
Danstuff, I believe you have some experience of this - cutting the rotor section from rear (avec handbrake) disc rotor to retain drum-brake for the handbrake, then chucking another disc over the top. This appears fairly straight forward - cut the disc section off on the lathe, mount, mount second rotor, boom. What am I missing?