It isn't difficult, but it is a lot of work. Most of the major elements of the GUI will have to be relocated in Menu_1024_768.ini. The individual components should be OK, but of course, they will be reduced in apparent size by 50%, so they will be harder to read and the gauges will be harder to set accurately.
All of the 2D screen backgrounds will have to be resized from 1920x1080 to 2560x1440. This includes not only the static screens, like the load screen, menu screens, crew status, etc, but also the periscope and UZO backdrops. You could just stretch them in a bitmap graphics program like Photoshop or Paint.NET, which would not cause any distortion but would visibly degrade image quality. If that result in unsatisfactory, then you will need to create your own screens at the higher resolution.
If you want to tackle this project, I'd suggest you PM either Ahnenerbe or VanJast, who have done the two 1920x1080 mods. They can give you a better idea of what is involved and possibly have some thoughts on how to do this most efficiently.
Good luck.
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