https://www.amazon.co.uk/BBB-Aheadstem-Steerer-Tube-Extender/dp/B012W4DX4G £16.29 + dental bills and very ugly Edited following below
Otherwise machining up an internal sleeve and bonding it to the current steerer, but almost certainly significantly more expensive than buying a new fork.
That BBB extender works perfectly and is invisible in use, it's just heavy.
Fair enough. Have edited the post to reflect your point.
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https://www.amazon.co.uk/BBB-Aheadstem-Steerer-Tube-Extender/dp/B012W4DX4G
£16.29 +
dental bills and very uglyEdited following belowOtherwise machining up an internal sleeve and bonding it to the current steerer, but almost certainly significantly more expensive than buying a new fork.