Daft question maybe
Horses for courses - less honey, smaller bucket?
No, not too much. As long as it is airtight and the honey is 'dry' enough.
When it eventually granulates the surface should be dry looking. Honey tends to absorb moisture from the air if the water content is lower, so the relative humidity above the honey, in a sealed bucket, is fairly constant.
The only time I have had fermenting honey was when I melted only part of a bucket. It must have been marginal overall but OK, and the melted part fermented. Lesson learned a long time ago, never to be repeated.
RAB