Not possible as to baseball/softball fields. The dimensions are completely different.
My solution:
Just have one team for each sport. No boys teams, no girls team. One basketball team, one football team, one swimming team, one softball team, baseball team, soccer team etc. Everyone is eligible regardless of gender, race or religion and may the best player get the position.
No Title IX problems. No discrimination problems. No whining. No lawsuits.
Best all-around, I guess, is to ban sports.
Equali-Polizei Triumphs Again!