MSAA does not work on all parts of the image and TAA uses previous frames to generate next ones. Both are kinda shit compared to DLSS indeed. DSR should work since it just enables you to run higher resolution, does the game not recognize the new resolutions you add?
DSR/DLDSR doesn't work if the game doesn't render the game at the new resolution.
Personally, i have a 1440p screen monitor
let's say I want to render the game in 4k : I enable DSR or DLDSR with x2.25 scaling (Compared to 1440p, 4k is 2.25 times the resolution)
then the game should detect the new resolution in its settings
this is not possible with last hope as i said because resolution settings simply don't work
the resolutions choices seems to be hard-coded without any smart detection process.
Even worse, I can't set any other resolutions than my native 1440p.
but I may have missed something for this step, if anyone has found a solution, i'm interested.