A program for converting skins wouldn't make any sense (especially for the icons and suchlike). I would just suggest using the default for what is missing since it if you don't plan on making the stuff yourself or asking the skinner who made it if they would be so kind as to port it.
It's Just That I Have Been Having a Hard Time Ever Since That I Saw Awful Hate Images of Ami Onuki, Sky (Friday Night Funkin'), Rabbids and Teen Titans Go. I Just Wish that People Would Change and Start Making Fan Art of Ami Onuki, Sky, Rabbids and Teen Titans Go Instead of Just Making Hate Art out of Them for a Change.
i'm sure there's fan art too, but what does it matter? if people hate them, that's their opinion and they're free to have it, that doesn't affect you at all