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@Scilly.Suffolk
The problem with an extension is making it stiff enough to resist twisting when shifting.
Filing the slot would buy you a couple of mm, provided the clamp still fully mates with the braze-on, otherwise you'll likely have the same problem as with an extension.
FD are cheap enough so Yoav's suggestion of using a triple is worth a punt, or possibly one of the newer FD that can handle both compact and standard rings, eg Campag from 2009 onwards.