I thought the fate of these characters were common knowledge by this point, but I guess not.
When it comes to "Beta Characters" you need to specify which era. For example: Kleiner around 2002 was either injured or killed after the test chamber given Barney's lines, its not conclusive either way however. Meanwhile, during 2003 its very close to retail and not reaaally worth discussion.
Odell's fate was unknown from what I can recall, a lot of the lines we have were complete placeholder to sort of get a feel for the atmosphere they were going for so I wouldn't take them as gospel to how Odell and his sequence on the Borealis would have played out.
Eli Maxwell is also fairly unknown, we know his background with his lost leg but... I think given the concept art we have, his purpose in the plot in conjunction with Captain Vance were likely very similar to retail - which would explain why the two were merged together... Although that's just speculation given the few voice clips and concept art, after all we do have voiceclips of Alyx during Mossman's betrayal, so the final sequence might have played out fairly similarly - but again, all speculation.