I think the answer to the op is quite simple.
Any job for which a very specific experience is required is usually a sign of a company not willing to take the (best) people from scratch(ish) and TRAIN them to a high standard appropriate to the operation, end of.
The more specific edperience you require the more potential very good people you are excluding, and looking long term (!!) no company would want that.
This is why selections at any air force full pilot career are tough but open to anybody (certainly not to cpl holders with 500 hrs flown at the local club for example).
The only thing that counts is selecting the right people, training will sort the rest and give you (hopefully) the best pilots.
We all know that this costs money and very few companies are willing to spend it.
Nothing to do with low cost, turboprop etc..just simple selection training and long term goals.