Assuming you are asking about a generative AI way, you could use photos of your new wife to train a LoRA with kohya-ss, then with A1111 you could do an img2img repaint using the ControlNet extension to make sure you get a similar pose. With enough experimentation you could probably get at least one decent result.
At least that's what comes to mind with the things I know you can run offline.
I know someone who did something similar. He remarried then went back to and cropped or deleted ten years of Facebook photos to make it look like he never had a previous relationship and just ten years of boys nights.
He even has a picture up of him from his wedding day… standing alone in a tux.
The kind of stuff the op is doing—-changing the composition to reflect a picture that could have been taken—-is one thing. But what you are asking feels Stalin-esque to me. A picture is a record of a point in time and you can’t change the past.
Sure you can, just as you can change people's memories and implant false ones. Hell, in this dystopia we're headed towards, it'll probably be a subscription service where you can rewrite 5 bad memories a month for $29/mo
This is why my family portrait is going to be a painting. In the future, you can just paint in the new generations and we can all be in the same frame together.
