Just make all sports unisex and it won’t matter. Except it does matter in some cases. Easy pick from the top of the pile is men’s and women’s gymnastics. There are plenty of comparative videos on YT showing one gender being able to do an event and the other being barely able or not able to do it. There are enough physiological divisions, that some movements and performances will be limited or enhanced by ones innate physiology. Skeletal structure, muscle structure, etc. It follows reason then, that a trans person can still maintain these advantages or disadvantages and therefore have an unfair advantage if they choose the related sport.
Honestly though, would really just rather them combine all sports as unisex and see what happens. Women will dominate some, and men others. I don’t see many women as dominating linemen in the NFL, but I likewise see very few men winning medals in women’s style gymnastics. Trans won’t even be a question anymore. Just give everyone the leveled field.