I mixed ProMix HPCC, which is Promix HP with a little less peat and added coir chunks, with micro bark. Micro bark is sold in many stores that sell EB Stone soils. It is fir bark and very even. I mixed in around 55% pine bark and 45% HPCC. I did a harsh root prune and repot a few weeks ago and luckily have no transplant shock symptoms. The mix stays damp, but never wet, not even 5 minutes after watering. Don't fertilize for around 2 weeks post transplant. You want the roots to regrow before adding any nutrients.
Where you are you might be able to find Fafard 52 or Fafard Nursery Mix. Both are great soilless growing mediums with plenty of bark. Or else get GreenAll Microbark. All these need some nutrients, Osmocote is a great option. If you prefer to do your own version of slow release try DynaGro Foliage Pro. You have to mix a tiny amount of FP in each time you water the plants.