Hi,
I managed to fix my problem, so I will explain here so if there's any chance that someone has the same problem, can fix it.
When starting the summer, I decided to look for replacements, and found that corsair has an online shop where they sell replacements for their cases, and so they do for their cases front panels. I wasn't able to find a front panel when searching for my model, the 275Q, but I saw the panel for the 275R case, which seemed similar. After thinking it for a while, because I didn't know if there was any small difference. There wasn't any, so for 10€ I got the entire front panel replaced. I ordered it on Thursday, and received it on Tuesday, so not bad. The installation was a bit tedious, because as I had manged the cables, I had to take the majority out, and the 24pin took a bit of time to get right for the panel to close.
I would have bought the jack on its own, I didn't mind replacing it by myself, but I cannot complain as their replacement catalog is quite wide and at a reasonable price, to be able to get the front panel for 10€ and so quickly I think is great.
Also, I learned that is best to have the audio cable separate from the PSU cable, as while rerouting everything, I placed both, the front panel audio cable and the PSU 8pin-CPU cable together in the same post with the same post and I could hear a bit of interference, I didn't think that would happen, but separating the cable fixed the issue.
I hope this can help someone who has the same problem.