I came, I saw, I registered - just and it produced a coop for me which I put in the coop missions file in BoS and Hey Presto! It freakin' works
https://forum.il2sturmovik.com/topic/36002-cooperative-mission-generator/?tab=comments#comment-606355
Still no slots available for breathers to fly for the opposition but pretty simple to generate a coop with plenty of options.