My experience for simulating rooting has been seaweed extracts. 2ml of seaweed extract in about a litre of water and allow the plant to sit in for about 30 minutes and then put it back in the potting media. it takes about 2 weeks for the hormones in the seaweed extract to take effect so dont over do it. water the plant when the medium becomes dry and watch out if there is any signs of any rotting.
given that it is a new plant, keep it quarantined and away from other orchids.
happy growing and keep us posted on how they progress