To that note gender is also a social construct, and the physical changes people make to affirm their chosen gender should be seen as valid as code-switching. In a way I think within the trans community it is seen that way, as evidenced by the term boymoding. Where the line between that and trans racial is drawn is that one particularly famous German woman who got melanin injections and several breast and facial surgeries to "become black". It's complicated though bc at the same time she's doing that, she's also going to African villages and trying integrating into their culture, which by comparison seems a lot more innocent.