To me that still points to ALIEN3. I dont think it will confuse people really. it definitely wouldn't be the first time a title has been re-used. in future people would refere to them as Blomkamp's ALIEN3 or Lynches ALIEN3, or ALIEN3(2017). there would be more of a backlash over the fact of taking the title from lynches movie.
"It's kinda quite bold"
"In the event that it doesn't work, I'm dead in the water"
I think what would really confuse people more would be not call it ALIEN3. Since its gonna be a sequel to ALIENS. most people will go to it expecting a sequel to Ressurection and be thnking... wtf?
Also i think most titles that would be ALIEN_____ just end up looking silly/cheesy imo.