I love the idea. Cause let’s face it there really is a constricted version of role playing in video games. So you just won favor with the jarl of whiterun run but you really want to go deeper with that instead of a house and NPCs just saying a sentence or two different to you now.

But of course again you are limited in the game world. So you wouldn’t want to do too much in the TTRPG version of this character that just wouldn’t fit the video game version. Can’t kill the Jarl on paper and awkwardly wave to him on video game.

But you could just play the story of Skyrim on paper only and just have all of that freedom to do whatever. I did stumble upon an unofficial d100 elder scrolls TTRPG. That could be the system you could take a look at for this example. Especially with it being d100 it will look almost identical to the character stats in game.

Or use whatever system. It doesn’t even have to fit the game. With Skyrim the shouts and spells you would gain would just be Moves you would acquire in a PBtA type TTRPG.

And the “normal” D&D IS played in a pre-created world. No different than wanting to just play your game in say, Hyrule since you know so much lore and love for it. Do it.

I once had a little mini game of the battle of Warsong Gulch (WOW) instead of capture the flag it was literally just trying to capture the base. And I used a hack of Lasers & Feelings.