Then you also need a realignment of the entire academic system as well. A new professor spending 50% of their time redoing the experiments of others, especially on capital expenditures and grad student time is going to be at a severe disadvantage against others who spent 100% of their time building their own research agenda.

We'd probably need a whole new degree that's like a PhD, but whose dissertation isn't a novel extension of the field, but reproduction of other studies. Because as it is, a grad student can spend up to a decade on a Ph.D. just doing novel research. Now you want them to spend 50% of their time on reproduction? So is a Ph.D. supposed to take up to 20 years with your proposal? Or does a dissertation contain 50% less novel research?

Certainly we should have funding for reproduction studies, but it's not enough to just have a grant; you have to have a valid career path doing such work. That doesn't exist today.