Is this A2000 recoverable?

[orange]

I've ordered a new socket, so that's on it's way

ouch, replacing the CPU socket is tedious/boring/...
I did it once on A2000 but it didn't help until I repaired an 'eaten' track.

I think you should just clean it and then try this:
http://www.amiga.org/gallery/index.php?n=2390

before de-soldering cpu slot.

if in the end you have to desolder (with ordinary soldering iron), don't do all 80 pins at once, save some for tomorrow..

[orange]

So I guess this might be the problem? How can I fix this?

sorry, I don't know. you have different board version, so I can't help you. you should take a photo of socket with removed CPU, and also from the underside of board.

IIRC, that last pin on CPU was connected to ROM, so it gave black screen on boot with broken trace, consult the schematics.

you can fix broken traces by using a wire to 'bridge' them, but be extra careful not to connect wrong points..