So there you have it...
You asked how to get it done and got a few answers... from people that have done it and have had it work.
You got some other answers saying how cruel it is, meanwhile you can tell from those same people's other posts, their hands are in their tank 100 times in a month swapping nems, swapping clowns cause they dont like the look. As far as i know thats a very very stressful thing to do in a tank. In and out and in and out....
I learned that the hard way.
Now you have a few other people saying leave it alone and let nature take its course...
I tried that too and in 3 years with 7 nems and 4 clowns in a tank none hosted.
What did you choose to do?
Did you have any losses?
Did you accomplish what you asked for?