Does Lankule propose any meaningfully progressive options for the treatment of women with his modern perspectives?

I'm not sure that he does do this. It does not seem that Soyinka consciously tries to make a statement about gender, but he does so nonetheless. On the one hand, he creates two female characters that are sassy, opinionated, manipulative, and independent. On the other hand, both of them are ultimately pawns in the games of men. Sidi does not want to marry either Lakunle or Baroka, but Baroka tricks her, rapes her, and then gets to marry her. She is an object and nothing more. Sadiku is also tricked, and sees her elation over the Bale's impotence and the power of women vanish as his plot is made clear. Women may seem like they have power in mid-20th century Nigeria, but they ultimately do not.