As you know, many (hymn) tunes are used for more than one set of lyrics. HYFRYDOL, for instance, shows up many times, and often several times in the same hymnal!
We have a new eight-handbell score based on the hymn tune DIX, which doubles as the music for For the Beauty of the Earth and for the Christmas carol As With Gladness Men of Old. Easy peasy – all you have to do is learn one piece of music, and use the correct title depending on the time of year!