Your design seems very good for cloning. I used a keg cup with ~72 cuttings dipped in rootone in a closet without light for weeks and got ~50% survival/success back in the day. However, I always risked a 100% wipeout in the event of some pathogenic infestation, which your individual technique avoids. Honestly, with present yields and methods, individual cloning is extremely preferable and warranted.

Thanks!