►Deflasking directly into your standard medium is no issue. What is important is to make that transition as stress-free as possible - constantly moist, but airy medium, maximum relative humidity, warmer temperatures, and moderate light levels.
The plants are going to need to grow new roots acclimated to whatever you put them into, so why add to the stress by deflasking into one, then later repotting into another?
► The medium drying rate is only important for two reasons: 1) If the medium is too fine or compact, "bridging" water will stay in-between the particles, cutting off the airflow to the roots. It must therefore dry quickly so they reopen. If the mix is coarse enough, it is actually better if it stays moist a long time (or even constantly), as that avoids mineral buildup. 2) Drying rate is connected to your preferred watering frequency, so it is a convenience factor only.
► Why use activated charcoal? Horticultural charcoal is not highly activated. It is used as a medium component because it is long-lasting and stable, not because it adsorbs stuff. It seems to me that the use of activated charcoal in potting media will 1) sequester nutrients, not allowing the plants to get them, and 2) more-rapidly accumulate wastes and minerals, leading to chemical imbalances, potentially poisoning. In flasking, activated carbon is sometimes used specifically to absorb wastes and the toxins the individual plants naturally emit as a defense mechanism to prevent "invasion" by other plants, but there is sufficient nutrition in the agar to remain available. In standard growth media, and when plants are potted individually, that's not needed.
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