Hi, I am a moron, so I say something stupid now.
Boys like their own spaces just as much as girls do.
I worked as an IT teacher for elementary school kids while I was studying and the boys loved to have a male teacher doing male stuff with them. And I was pretty much the only male teacher they have ever seen.
Boys have their whole lives to cope with women, at home, at school, everywhere.
Leave them their own space, if you want girls to learn something about nature and survival create your own thing, but leave something for the boys.
If the boys want, they can join you, if they don't well, who cares. But taking away their space to create new groups within their space is just spiteful.