How about something completely new and original?
This. As much as I like the fourth season, it was a 'TOS fanwank, cruise around the neighbourhood' season and its best episodes are not coincidentally the Vulcan and the Babel three-parter, genuine 22nd century stuff.
The fifth season couldn't have continued along these lines and would have had to focus more on actual deep-space exploration. The emerging conflict with the Romulans would have automatically brought the Enterprise back home.