[Membership 2 Pro] Show excerpt + read more for posts in protected category


I would like to hide articles in most categories but show the first few lines (before the "Read more" tag), a bit like the ft.com does. I cannot see a way of doing this.

All I have been able to do is hide the rest of the content manually using shortcodes, but this is a pain for nearly 10 years of content (I'm about to relaunch a static html site as a membership site – the url I've given is the old one, I'm working on the new version separately).

Is there a way of only applying the Read More protection for certain categories? If not, a) would it be too complex to provide some code for me to use in the plugin and b) could you add this as a feature request?

Many thanks,