Update ... Ends up that they sent me the wrong memory the first time (and put a sticker on it labelling it as the correct memory, so they didn't realize it until I had sent it back). The next set of memory also didn't work. They are out of parts, so are just refunding me my money.

So, that experiment didn't pan out. Any suggestions on where to find 4MB PAL SIMMs for a Mac II? I think that I am still interested in trying this.