The 82559 is a different part in a different package. Yes, it's only one digit away from being an 82558, but it's not the same thing.
I do have more info coming, but it looks like the hack killer on this is availability. Avnet has some, but at $48.40 each at a minimum quantity of 24 I'm not interested. This is an obsolete part and seems to be largely made of unobtainium, which everyone knows has skyrocketed in value with the NASDAQ fluctuations of the last few weeks.
If you've got one that can be desoldered, and the skills to do so without destroying the part, great! Otherwise, forget this hack.