Change categories? Still not possible.In 1972 you know this wasn’t an issue because medical tech hadnt yet caught up and it was taking your life into your own hands to be gay let alone trans. In the 80s and 90s this was exceedingly rare and handled quietly.
For athletics, the categories are genetic, not social. One category is XX, and the other category is XY. No technology on earth is capable of "changing your category" from one to the other.