If you want to give it a try in the future, apparently there are ALLEGEDLY ALPS sticks for the Vita Slim on AliExpress and other Chinese stores. If they are indeed ALPS, these tend to wear off less compared to regular potentiometers since they are considered better quality.
Discussion
The replacements I'm using is good and it's enduring so maybe it's the same kind ? I'll surely buy those tho to keep them as reserves, at leat a pair.