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@LWaB
It will be difficult reshaping head tube enough to let the bearings turn freely. Even if you mostly get it right, you are highly likely to have a draggy bearing that wears prematurely. For a headset bearing, this might be acceptable. They don’t typically wear out, instead dying by corrosion, contamination and brinelling.
If it was a steel head tube, you could bash away at it until you thought it was good enough and likely have enough meat on the head tube to cut the bearing seat round again. Aluminium, not so much.
Cracking of the head tube bearing seat while riding afterwards, you could possibly ride to a stop but the bearing might jam. That would put you on the ground instantly.
Your choice to try to fix it, I wouldn’t.