Uh, a turboprop is not a jet, and you're not qualified to sit in the left seat of one without some experience. Nobody in their right mind is going to let you sign for the jet unless you have the requisite JET hours.
These might be the rules of the game in the US.
In the SW corner of Asia, there is a company that has been taking Q400 captains with zero jet experience straight into the LHS of 737NG for last couple of years.
No problems observed so far.