As far as I can understand there is only one way to become "transracial". You have to already have the genetic coding for that race.For example you can not define yourself as a TransNativeAmerican with 0% native american in you.

I think the biggest issue with trans culture these days is because people seem to think "I am X because I say so". You are not X because you say so. There is a lot more to it. There is a lot of deeper psychological data that needs to be involved.