Plugin for splitting posts in the feed?

Since the “Read More” in the feed feature was disabled in version 2.5, I’m searching for a plugin that will reenable that for me. I want my articles to truncate at the more tag with a link back to the original article when they show up in the RSS feed, just like they do on the regular blog site.

I tried using Ozh’s Better Feed plugin, but for some reason it isn’t working for me. Ozh is planning an update for 2.5, but does anybody know of another already-existing plugin that would work for this? Or maybe does anybody know a way I could make it happen myself?

If you need / want to take a look at the specific blogs I’m working with, they are:

https://fandomania.com
and
https://mechazilla.com

Thanks!