Is there a way to make a prop or hair item into a figure wich conforms to Genesis?
NO YOU MAY NOT! I forbid you to do it! You absolutely MUST NOT!
But have fun doing it anyway
What you might try doing is go to r.com or wherever, download clothing and translate it to Genesis. You’ll need Victoria 4 shape for Genesis or Michael 4 shape for Genesis depending on the clothing you’re converting. I found doing this helps one understand how conforming anything works with Genesis