Alien: Romulus sequel ideas.

Hmmm I'm not sure if Andy would be sneaky since he no longer has Rook's chip.
Also I would have it to where their ship would be boarded either by Weyland-Yutani, BioNat Corp, Chigusa Corporation, Grant Corp, Wal-Mart, <insert new WY rival>, the Colonial Marines, scavengers, or space pirates

I just don't think it matches his character to start going all Ash/Rook/David on us

I see Andy as somewhat childlike, struggling with complex ideas. Without decades of their shared experiences, it's tough to define their personalities definitively.

However, Andy is clearly aware of Rain's constant need for money, as she's always selling something. So, from his perspective, why not sell something that appears valuable?

Rain and Andy reach the planet Ivaga III. It is a rather dark planet but with an atmosphere and terraformed. They land at the airport and on the terraforming blocks there is an inscription "Hadley Hope". She starts Andy and goes with him to the briefing. She looks for someone who will fix him. She finds a mechanic but is betrayed by him and for smuggling an artificial human being she is locked in prison. The police search the ship they arrived on and a mutated woman comes out from the ship's interior, who is similar to Shaw from Covenant. The police catch her and lock her up in isolation. After a while she gives birth to a small alien - an alien queen who escapes. They call Rain and Android for questioning. She says that they have discovered a secret space station and the Romulus laboratory where Xenomorphs found by the Nostromo ship on LV-426 were being studied. The commander says that the second name of this planet is LV-426. So they send ships to scan the planet and find a ship in the shape of a horseshoe of engineers. Two males are impregnated by facehuggers. when they return to the colony, the battle with the Xenomorphs is already underway and the queen has built a nest...

Excellent Idea Michart! That would be very cool.

They need to get the characters right + obviously a good story.

LV-426 already has a second name and that is Acheron!

To expand upon from above, LV-426's official name is Acheron, look it up its on the internet and on the ALIEN DVD and BluRay! Also LV-426/Acheron orbits a planet, called Calpamos thus is a moon and its star is Zeta Reticuli.

Calling it Ivaga III makes no sense with planet naming convenations of that type since Ivaga would be its star name and LV-426 doesn't orbit Ivaga, it orbits Zeta Reticuli.

Yes but I inspired by screen showing star system, destination to Ivaga on The end od movie. Its similar to  Retikulum system. Mayby corporation tells rumors that it's planet very good to live.

More than likely Ivaga is going to be an original planet. I mean it serves no purpose to the narrative to retcon an established part of ALIEN canon like that. LV-426/Acheron is an iconic planet in sci-fi much like Tatooine and Vulcan