You might want to check out this book that sounds very similar to the structure you're describing. My advisor and his partner had many debates on if clothing and performance done at a certain age range constituted a full gender, but the hierarchy is similar. shop.japansociety.org/catalogues/a...

A Third Gender: Beautiful Youths in Japanese Prints — Japan Society Shop

Written by Joshua S. Mostow and Asato Ikeda, Contribution by Ryoko Matsushiba Gender relations were complex in Edo-period Japan (1603-1868). Wakashu , male youths, were desired by men and women, con...

Oh, yes! From what I know, wakashu seem to very much be within the recognizable range of third-sexed effeminate and transfeminine populations.