Hmm. Some interesting ideas but for me, Aliens has always been Ripleys story. So far at least. I get that 3 and Resurrection have their fans... But I always disliked how the ending of Aliens was undone. If it were up to me I'd take it back to that point somehow. And from there tell the story of an older Ripley who functions as more of a supporting character - with Newt being the main focus of the story. I think an adult Newt could be very interesting and compelling.
As for the alien itself - I don't think there's anywhere else to take it. So rather than try and reinvent the wheel - I think it should just be a kickass monster movie. This wouldn't be a film you see for universe building or franchise padding - just a lean no frills thrill machine.This would be a film to scare, shock and entertain. Medium budget, 1 hour 45 min run time...
Supporting roles played by actors like William Sadler, Michael Ironside, Ernie Hudson. Just a good, decent and honest genre movie.
City in space, Alien gets loose, Newt goes to help, teams up with the residents to defeat the threat.
that'll do me