Keywords in Ticketing Setup

Is there any reason why you CANNOT change keywords related to Productions after they have gone on sale?  Our Keyword list has grown organically and we now want be more disciplined about the use of keywords.  We are setting up a new season, but I want to go back and change all of the currently on sale performances to the new set of keywords.  

 

I realize that we will have to visit the remaining performances in the current season and apply the new keywords, but, will doing this break anything that I haven't thought of?