I’d do this.
Meta Gear Solid. I’d upgrade the entire visual aspect of the game to unreal 5. Bring the gameplay up to a 3rd person perspective much like they did with mgs3: subsistence and future Metal Gear games going forward.
I’d update the audio only for the ambience and sound effects. I’d take all the voice acting done in the GC remake Twin Snakes and use that in this version. (The likely hood of that happening is so far-fetched, but it’s what I’d want.)
MGS was one of those games that blew me away at the time, and while aspects of the series got better, I feel it lost a lot of the appeal thanks in no small part to MgS2. 3 was great, and there’s an argument there to say “Remake that!” But, the first one would be my choice.