Ditch Ripley entirely.
As for an 'ALIENS 2', sure Bring it!
Bring back Colonial Marines, absolutely! Who doesn't want to see more USCM vs xeno action? Is Ripley really that necessary to that end? No. What's more, 'She Who Cannot Die' makes no sense in a series of movies where mortality is a criticial theme. Especially when she's already deceased.
Her story has been told. It's over. As a character she has nothing more to add except recycling what we've already seen. The time to move on is long gone. Fresh stories. Fresh characters. Please. It's a big Universe and it should be treated that way.
Pulse rifles. Aliens. Bring the action to another setting. Now, tell you won't go see such a movie without Ripley in it.
-Windebieste.