I like the execution of Ben surviving in this version, but what would happen next?
The movie carries on as it did. After the main trio hugs at the celebration, instead of cutting to Tatooine, it cuts to Red Five flying towards the Ahch-To island. Rey walks up the Jedi Steps and into a hut. There she builds her new lightsaber and ignites it. She walks to the same place where she found Luke in TFA. Rey sees Ben watching the Binary Sunset. The ghosts of Luke, Leia, and Anakin watch as Rey and Ben stand together. THE END.
I like this version, but I just had another (probably slightly easier) idea: since the trilogy is filled with instances of Rey and Ben looking at each other across impossibly long distances, what if you take the normal ending with Rey on Tatooine, and add a few composite shots of Ben looking off the cliff from TFA to make it seem like they’re looking at each other?