I have a question, what's the point if the game is actually played with 4k like Assassin's creed Valhalla on a 1440p monitor. If it is then operated downscarling or whatever you call it, it looks sharper than when you play native with 1440p (4k to 1440p)
You should first buy the Ps5 version of it then it will be set in the settings of the respective game (PS5 version) how the colors and the quality should be.
But it would be worth it because with a few graphics changes a 4k game on a 1440p monitor looks like it does on a 2440p monitor
For this, the monitor has to accept a 4K signal at all, which I normally don't think is the case. Then there would be supersampling, so the image would be scaled down, which can certainly offer quality advantages (but I have no personal experience with that).
Incidentally, the XBoxes offer (more or less) native 1440p modes.
There's no such solution.
140 Maybe.