It doesn't fit into 28C Wild Specialty if it doesn't have spice, herb, fruit, wood, or vegetable. Honey would not count here.
But it might fit as 31B Alternative Sugar Beer, IF the honey character comes through obviously in the flavor.
Otherwise, it is a 28A Brett Beer.
Remember, the judges don't get a copy of your full recipe. They don't necessarily know you've used honey in any style. If you enter a style like 31B where you have to supply them with a description of the style and special ingredients, they will look for the honey or other ingredients that you've added, and if every specified ingredient doesn't show up, your score will reflect that.
So enter the style category above based on how obvious the honey flavor is. If it is very subtle, do not enter as 31B alternative sugar. They don't have to know that you used honey if it doesn't show up.
I'm assuming, however, that the Brett shows up. If it doesn't, then the base style would likely be 25B Saison rather than 28A Brett Beer.
This stuff does get confusing. This is one of the reasons I dislike the 2015 BJCP Guidelines and wish they would simplify back towards 2008. They said it was broke, and aimed to "fix" it. But if you ask me, 2008 wasn't as broke as they thought it was.