Actually whoops, these are 0.5mm balls and I really need 0.6 to do the job right. Ordered some as I didn't have any in stock.
Anyway, I figure it's worth trying. This chip has been through hell by this point, two of the GTY RX pads are damaged (but not completely gone - so may still make contact just mechanically less robust).
I'm now thinking of making a little OSHPark test board that basically hooks up power, JTAG, cooling, and breaks out some of the SERDES so I can play with it, but not a whole lot else. Not sure I'd trust it on the BERT (which is still happening, but likely not with this physical chip).