[Sal the Mudokon]

Well, as for glukkons having the same or a similar operation as the one that Stranger is saving up for is not likely as all images of named glukkons appear to show a very natural creature that walks on its larger, upper appendages and uses its 'feet' as hands (like that asshole podracer from Episode I, his name escapes me). The covering of these infantile 'hand-feet' by their human-looking business suits is the reason for their dependency on sligs in certain possession levels of the games.
Now, I'm not sure if Secto's host-Steef did or did not have the surgery and if he did, whether or not it was before or after the Octigi began using him. His legs appear very small, but much about Secto is not as it appears so that's in the air.

But as a further debate, what of the Vykker's walking appendages? They have clearly been sown up to a nub. Why is this? Were they originally long bony tentacles that became impracticle? I've a theory that maybe they originally hung upside down from longer appendages. Due to the movement of the industrialists to model themselves after humans at the expence of their own comfort, the Vykkers removed these appendages down to small nubs. The unnatural change from being upside-down to being tripedal would explain the incredibly poor posture that the Vykkers have due to an overbearing skull.

Another examples of moving towards human nature is exhibited in the sligs becoming bipedal. This of course is an example of how a slave-class creature became human-like in order to be MORE efficient.