Advice Wanted. Kent-Barker Insert:-

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I would like some advice about bringing this model of Kent-Barker up to clean air standards without sacrificing internal area for burning. As where I live I am in a air-shed and it needs to be up to clean air standards. If someone could please help me. They also recon the hearth needs to be extended, I don't think so.
 
I would like some advice about bringing this model of Kent-Barker up to clean air standards without sacrificing internal area for burning. As where I live I am in a air-shed and it needs to be up to clean air standards. If someone could please help me. They also recon the hearth needs to be extended, I don't think so.
No idea what requirements in New Zealand are but here it would take about $100000 in testing and certification after your r&d and fabrication. It needs the certification tag. I assume it's similar there. Although with an existing installation you don't need to meet that standard
 
I think your goal of clean air without sacrificing firebox volume is likely impossible. You'll need secondary air tubes which will take space in the top of your firebox.