For anyone wondering how to get the Mayasuran Commission, I just happened upon this purely by RNG with no other mods running (aside from the ones required to run this) alongside it. Now I'm not sure if this will work for everyone but since it worked for me, I figured, why not everyone else?
So anyway, I was going through the bars looking for jobs and I happened upon one for a military bounty, so I took it. Upon completion I got a potential contact with an Archon from the Mayasuran Navy. So I registered the contact, lo and behold, the Archon has the commission option, among others.
[edit]: Okay, also happen to be running a portrait pack mod as well, though I doubt that had any real impact.