But you said
Out of the crew base across all company's operating my type there must be about 140 crew qualified to fly it in Europe
In the last year I personally know 10 of them that have moved on to jets. 4 of them to 757 and bigger and 6 that have moved to heavy long haul biz jets.
The ones I don't know personally there are about another 20 that I have heard of. Mostly biz jets but more than a few to 100 ton plus machines and a surprising number to 747.
Frankly, I'm bowing out here. Your attitude towards integrated flight training is the worst case of confirmation bias I have ever seen.