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That might be ok. The race looks alright. The steerer looks reasonable - it can tolerate a bit of corrosion.
The critical thing is whether there is rust on the surfaces below the races.
That said, roll up that o-ring and check the interface between the steerer and the fork crown. That's also a press fit - of the industrial variety - and in this case it's a steel press fit in to alu which can be weakened by corrosion.
No bench vice alas... I've applied "please" and 100 kg of manfriend on top.
But there's a bicycle workshop here, I know the guy so I can ask him if I can borrow or rent some tool :)
No yellow fork boots anywhere it had two holes so off it went :(
eBay kleinanzeigen and markplaats have stems, and there's a German 'dale shop that has needle bearings etc.
Hi rust...