Dough can be divided into many parts and baked as smaller buns as per need.
I have baked as a single large bun but it is not needed.
For stuffing the sugar can be replaced with honey or any other sweetners.
Baking time differs from oven to oven so be watch full while baking.
Always bake the bread by keeping in middle rack if using otg.
I have used instant yeast for this bread if using active dry yeast it the same but it may take a little while to proof and it cannot be mixed with the dough directly.
You can substitute wheat for all-purpose flour.