As for airlines promoting DEC even from turboprop there is at least Cityjet (known as ****yjet 
) and Wizzair have tooken lots of ATR captain with no jet experience, straight on the left hand seat of a brand new airbus and so far there have been no accident nor incident report.
Not strictly true. Several of these ATR guys were employed by Wizzair as DECs and it was suggested afer a while that they would benefit from a period in the RHS. At least one actually requested that he did 6 months RHS before movng to LHS (very experienced etc but had the nouse to recognize it could be a tadge demanding to operate unfamiliar equipment in demanding environment). A few went left-to-left but had considerable jet time in the past. In any case, Hungarian law requires a very large number of LHS sectors with trainer.
This is not meant in any way to diminish skills and talents of ATR drivers. I agree, these types can be mored difficult.