Having consulted the list and concluded I was unlikely to find a Bios Saviour, I went at my chip with a push pin and some superglue. Success! Thanks to all who made suggestions. I have two important questions:
I've found a UK ebay item of 6 SST 39SF020A chips, which appear to be the ones I want for my EPIA-MII 12000. Am I right, and could I go for a 4Meg chip if I wanted?
Additionally, I have next to no coding ability, so I feel it falls to me to contribute in some other way. There are 6 currently available in the auction, and I feel I need at most 3. Are there any active developers who'd like a free 39F020A? I'd quite happily buy the lot and send the unneeded ones anywhere in Europe, if it'll do some good to the project. Heck I could probably stretch to the US if the postage isn't too hideous.
Any takers? The auction ends in 5 days, but its a buy it now, so if I want them all I should probably get them sooner rather than later...