I know I'm late but
I made my own skin that I can customize freely, mixing a lot of things from here and there, ending up with a skin I can use all time. The skin has items that can be altered, so there can't be only one item for every skinnable thing, including hitsounds. Seriously, mapping is an art, but hitsounding is another art, hence Audacity and the wide options of hitsounds one can use.
Unsure if the changeable items will be included in the .osk or not...