Trying to think of some other TSR entries that would make good OAR books - those with a good story and/or multiple reprints.
A1-A4 (+A0?) - Slavelord series. A classic with a lot of history behind it and ripe for sections that could be expanded or reinterpreted. As well as subject matter WotC isn't likely to touch with a ten-foot pole in the current environment.
GDQ (G1-G3, D1-D3, Q1) - Giants/Drow/Demonweb, especially if they could include the tournament packages for the D series. I think this series may have had the most reprints throughout TSRs lifetime
S1 - Tomb of Horrors. Lots of history on this one, but not a lot to expand or reinterpret. It's been reprinted already in Tales of the Yawning Portal, but I'm imagining Goodman could do a 5E version that's a lot scarier and closer to the difficulty of the original.
C2 - Ghost Tower of Iverness. I'm sure there some interesting history on this gonzo tournament adventure, and I'd be curious to see the 5E conversion/adaption.
I3 - Pharaoh. Though out of the range of the adventures usually covered by OAR, with it being one of the first Hickman adventures, it would have an interesting history section, I would believe. Could include the two follow-up adventures, but the original stands by itself well enough I think it could be done as a stand alone.
B10 - Night's Dark Terror. Though I've never run it, there's a lot of people I've run across who swear on how good it was. In that regard, it seems right it should be given a full historical and conversion treatment.
N2 - Forest Oracle. I want to know how this got past Q&A and ended up being published. And then an honest attempt to fix it - by sitting the original writer down and forcing them to properly rewrite it!