Can this be cloned?

I have 12 seedlings all growing right into my scrog screen atm; and I have no idea wtf sex they are.
Are these branches old enough to be cloned? IDC about removing the whole branch; I'd rather that since my screen is basically 1/2 filled already in vege.(as soon as their branches reach it)
I don't even care about roots; I just want flowers to start popping so I can see what they are
The plants are about a month old now

The branches are 2 obvious nodes with some stretch, and a cluster at the head; 3-5 nodes total. I was thinking about cutting tomorrow, and sexing them under 10/14.

 

Thanks, I took em tonight. A few are kinda small (2 inches), little worried about them sexing. On a 10/14 now.

On another related thought;
If I stick two clones in a cube, and I know 100% they are females, would it matter? I don't care if the root mass is shared; I was going to dwc for the first time with them. Would it inhibit root formation between the two? I wouldn't think it'd do much, but there could be something I'm missing entirely

 

Sadly I dont have the space. They were just mishaps within my garden; While training, they broke. Haha. IDC too much about roots fighting for space since its going to be in a DWC; my thought was to grow it as if it were 1 plant.