The advantage of several thousand hours of turboprop time will not translate into an advantage over a low hour pilot with a jet type rating. Take a look at any recent recruitment. How many experienced turboprop guys got an interview compared to low time guys willing to fund a type-rating?
I cite the recent Jet2 recruitment drive. Many TP drivers seem to have been overlooked in favour of low-hours chaps and chapesses.
If, as you state, your intention is to go "Jumbo and beyond", get onto a jet as fast as you can. If it means overlooking a TP job, so be it.
Me personally? I'd rather be earning £20K a year in a flying job whilst looking for another flying job than earning £40K a year in another job (when the only flying you'd do is that to required to renew an IR and MEP).
Flying TPs might be sh*te, but it's not that sh*te.