I fly ATRs and a lot of the captains here are ex-747/340 who felt like having fun a last couple of years before heading home. And by the looks of it they're having a blast.
Don't look down on Turbo prop experience, some Dash fly better than jet planes. Get a few hundred hours TP and then get on a jet when you can. Just know that without solid contacts, it might prove much harder to find a position on the bus or boeing compared to a TP operator
Just out of curiosity, what makes TPs more fun than jets to fly?