While I do not disagree about the importance of calcium availability to most plants, it should be noted that people who are very experienced growers have stated the reason for Drosophyllum's intolerance to root disturbance has to do with it's inability to form adventitious roots, which is why root, leaf, and stem cuttings do not work exvitro, ever. I am unaware of it working invitro.I am at least partially convinced that Drosophyllum may perish in cultivation because of a lack of minor nutrients, such as calcium, which are often present in Mediterranean soils. Many photos I have seen suggest that cultivated plants are expressing symptoms of severe calcium deficiency (burned leaf tips, curled leaves, inability to form roots correctly, inability to flower or set seed correctly). I am not claiming expertise, but I have a strong gut feeling that some of the common problems with this plant can be traced to calcium deficiencies. Calcium is often involved in meristematic growth, so if the plant were lacking it, you would see things like (a) low or nonexistent seed set (b) inability to flower or death at flowering (c) inability to form new roots, which may explain why transplant shock is such a problem here. Calcium is incredibly important in proper root growth and root tip formation. Most of the media I see recommended have no way of getting minor nutrients to the plant because they are sterile.
So in addition to the above, I will load the media with a 1/4 concentration of a complete fertilizer and see if this stimulates growth along.
Also, the term "complete fertilizer" applies to any fertilizer that has the three main macro-nutrients (N-P-K). Most commercially available "complete" fertilizers do not contain calcium unless explicitly stated in the ingredients. Calcium is considered a "micro-nutrient" and is usually available in organic fertilizers like kelp meal & bone meal, and also available in soil amendments like lime & gypsum. Bone meal is used extensively to boost calcium availability in soil for garden plants that produce edible fruit, but calcium is mostly ignored for growing plants that are not explicitly grown for fruit ("leafy greens").
That being said, I think you might be getting calcium confused with phosphorus, which aids in root development and flower production (phosphorus promotes flowering, calcium grows the fruit after words).
Many people who grow cactus plants do add bone meal to their soil, citing increased growth rate due to the calcium made available to them. Drosophyllum, however, is no cactus. But if you are going to experiment with calcium and its affects on Drosophyllum, I would start by adding bone meal to the media the same way cactus growers do, and skip the "complete fertilizer" route entirely. Bone meal doesn't just provide calcium, it also breaks down into soluble phosphorus that is usable by plants. Another possibility is gypsum, which contains both calcium and sulfur. It has a slight acidifying effect on the soil, and the sulfur seems to be harmless to CPs. A liquid seaweed extract added to the soil at biweekly or monthly intervals would most definitely increase macro- and micro-nutrient content in the soil gradually and might be worth trying on a separate control group but I have no idea what concentration to recommend, and I think it would be a roll of the dice.
That's just my 2c, feel free to ignore everything I just said.