To be fair, the disk images are actually pretty tough to find. There've been a few times where I've spent a while looking for them because I lost the files on my computer and forgot where they were online. And that page isn't indexed on Google, so you really need to know where to look.
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That "other unix" is probably UniPlus Unix, which we actually do have copies of, as well as its source code. It runs great on the FPGA-based Lisa too.
Here's the source code: https://github.com/arcanebyte/uniplus
And here are the disk images, although I think you need to be logged in to download them: https://lisalist2.com/index.php/topic,103.0.html
How did I manage to miss that
To be fair, the disk images are actually pretty tough to find. There've been a few times where I've spent a while looking for them because I lost the files on my computer and forgot where they were online. And that page isn't indexed on Google, so you really need to know where to look.