They could have their own relay/instance to maybe bring the porn levels down but yes. Thats an issue. Maybe embedding zap.stream onto a self hosted personal web page for the livestream. I’ve uploaded clips to zapstream before, seems to work ok! 

 This would be about the best option.  

 It’s the best I could think of but maybe someone else will think of something better! 

 Basically you just need a relay that only lets one keypair write to it, and open to read for anyone. I don't know how to do that, though.  

 I don’t either tbh but seems very doable and worthwhile to figure out!