Showing older episodes in the field while hiding younger ones

As our episodes age, we make them accessible only to paying subscribers. We simply set a limit to the number of episodes available in the feed (the limit is 10 now).

However, we’d like to include among the freely available episodes some older ones. We can do it changing the date of those episodes. But this means changing it every time a new episode comes out.

Is there another way to do it?

I updated the title because maybe it wasn’t clear. Is this possible?