It is an interesting case. My first reaction was "too easy a rhyme, too intrusive." Then I thought about the divot, knew what you were talking about and really liked it. I still do. And when I read pivot as a bit of semantics, I like that as well. That is, I like what you are saying and the ideas and the rhythm. Except that "pivot round the divot" has a corny sound. I think now that the problem is more in the reader's ear than in the poem. (I also have an echo in my mind of the old rule "Replace your divot!), and that adds an imagery problem. Nah, don't change it.