I had always read it's 50% fermentables from honey for it to be a braggot.
FYI I make a dirty blonde ale with 2lbs of honey in it, definately not a braggot, IIRC that makes for about 20% of my fermentabled from honey, the taste is there, as well as some complexity, but it finishes within a 8wk period (2wks primary, 4wks secondary, 2wks bottle) and it doesn't require yeast nutrients.