What if someone started an organization that identified these injustices to cis women, and created and awarded their own first/second/third place medals the cis women who would have placed if the transgender competitor in question hadn't been there...
The organization could officially record their results, have their own presentation (or just post the medals/trophies/whatever.)
This would be a great form of protest. Taking back the results for real females.
I'm not doing it, of course. I'm just a lazy idiot, but someone else could...