I don;t think salt and flour based dough would be able to be waterproofed enough that you could keep honey in it. Even with a couple of coats of varnish I've had things get damp and mouldy. Especially in a damp/steemy kitchen.
You could perhaps use it to make a pot to hold a small jar of honey. That way if the pot does get wet or something you could replace it.
Another option would be to use glass paints to decorate a jar. I know the ones I've looked at you can put the jar in a low oven for a while after baking and then the paint is dishwasher safe.