It might be useful to draw experience from Ultimate (ultimate frisbee), as there's been mixed teams competing at world championship level since 1999.
Not saying it's a utopian example but as it's been around for some time there's bound to be some learnings.
I've played it at club level, my husband at international level (club and country) and I think it does offer an inclusiveness that I haven't seen elsewhere.
Mixed sits along side open and women's teams and so people can play the version they want at club level, some play both when schedules allow (UK open & women's tour is held at a different time to mixed, for example)
Of course there's been the 'men don't pass to women' issue, but I think that's partly addressed by continuing to establish the division and it's existence as a variation of the game, with its own strengths and highlights.The more it is played and seen, the more normalized it will become.
Ultimate is non-contact, and games are governed by the spirit of the game rather than a referee, which encourages self control, courtesy and fair-minded competitiveness. Both of these things help lend Ultimate to mixed sex sports.
I've no skin in the political game, I'm just here to give an example of a sport that is successfully incorporating the mixed game into it's offering, and as it is doing it alongside open and women's, together they are all making the sport stronger.
(Also it's lovely to play and I wish my knees would let me these days!)