I don't believe any other pre-USB Mac listed here has an external floppy connector, exception is made for some PowerBooks.

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I presume you are including the Macintosh Portable (LOL) in the PowerBook category? If so note the following: the Portable uses a full sized DB-19 external floppy drive connector. Any pre-USB PowerBook with an external floppy connector would use the HDI-20 connector and therefore could not use any of the pre-PowerBook external drives, but only special drives made just for the PowerBooks.

This is always a handy reference chart straight from the horses-mouth:

http://docs.info.apple.com/article.html?artnum=5911

Any Mac with an LC PDS can theoretically have an external floppy drive on it, although that drive will be a 5.25" drive for use with the Apple IIe card. I think I also heard the 3.5" drive for Apple II's will work.

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According to Apple, it will not support the 3.5" disk, but rather the Unidisk.

http://docs.info.apple.com/article.html?artnum=8807

The Superdrive is accessible internally, so it may possibly work externally as well. Interestingly the TIL article doesn't exclude the use of the 800K or the FDHD. However, I would imagine none of the Apple drives would be accessible from the Macintosh side and only within the Apple II emulation, so it's kind of a moot point.