Any hope for that derelict HP-25?

[Benoit Maag]

Just bought on e-bay an as-is HP-25 with the intention to upgrade it with a Panamatik LP

Unfortunately, the machine was in a much worse condition that I expected (see slide 1)
After an hour with vinegar, Q-tips and an old toothbrush, I could get to a slightly cleaner board (slide 2), but there is still some blue corrosion I cannot reach, and some lines on the keyboard PCB are damaged and cut-off

Is there any hope to get it back to life?
Is it realistic to fix the broken PCB lines with conductive paint (like Bare Paint)?
Should all blue corrosion be removed? Any suggestion as to how to do that?
I damaged one of the feet - what is a good replacement? (eraser cut to size, caulk...)

Please help - Thank you