I’ve done the hardware mod at home following instructions provided by the mod guys.
It basically consists in replacing a capacitor and an inductance for ones with larger values.
I didn’t have the correct tools for this (the components are surface mounted (SMD) which ideally requires a hot air gun) so went into a scary moment, where I ended up tearing up a bit of the copper from the board (!!!) , but eventually managed to save the situation. The noise is indeed reduced now.