There isn't something like that at the moment.
Basically the whole Premium experience is just that chapters, new chapters, after a certain point are locked. So,
a)you either use up your saved Spirit Stones and unlock the chapters or
b)you buy spirit stones in case you don't have enough to just unlock or
c)you watch a video and unlock the chapter that way.
The only difference now is that chapters are locked earlier. Before the changes only the newest 2-4 chapters were locked, everything else wasn't. So, you could save up some chapters and power-read through them. Now, you can't.
~ Fernweh