Portal to Nautilus in Omega Sector?

Its not Perion exactly, and its only one way.

You talk to the npc Karcasa(you impersonate Tigun and talk to him in one quest).
He offers to get you to a "random" town in Vic for about 10k I think.
The story guise is funny, he "smuggles" you back to Vic aboard a cargo ship

No, she was talking about Manji's quest. Manji has a quest with a maximum level of 29 where he will send you to Ariant for free, and instantly, up to 5 times. It mostly exists just to get 2x to ariant and make sure Ariant gets used.